TASK 72-41-20-440-003-C00 HPC Rear Cases And Vanes Assembly - Assemble The HPC Stage 9 Stator Vanes To The Cases, Assembly-003, SBE 72-0627

DMC:V2500-A5-72-41-2000-03C-710A-B|Issue No:002.00|Issue Date:2019-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-41-20-440-003-C00 HPC Rear Cases And Vanes Assembly - Assemble The HPC Stage 9 Stator Vanes To The Cases, Assembly-003, SBE 72-0627

General

Fig/item numbers in parentheses in the procedure agree with those used in the IPC. Only the primary Fig/item numbers are used. For the Service Bulletin alpha variants refer to the IPC.

For all parts identified in a different Chapter/Section/Subject, the applicable Chapter/Section/Subject comes before the Fig/item number.

For standard torque data and procedures refer to SPM TASK 70-41-00-400-501, SPM TASK 70-41-01-400-501 and SPM TASK 70-41-02-400-501.

Special torque data and assembly tolerances are included in the procedure.

Lubricate all threads and abutment faces of nuts and bolts with CoMat 10-077 APPROVED ENGINE OILS, unless other lubricants are referred to in the procedure.

After assembly apply CoMat 07-038 AIR DRYING ENAMEL to any damaged surface protection, joint flanges and parts used to attach. Use the correct color of the air drying enamel. Refer to SPM TASK 70-63-02-380-501.

The number for each radial location must be identified in a clockwise direction. These start at the engine top position when you look from the rear of the engine, unless stated differently in the procedure.

Refer to Figure for a sectional view of the HP compressor rear cases and vanes.

Make sure all the flange faces and tool faces that touch are very clean.

The Fits and Clearances, NEW PART DIMENSIONS and REJECT IF MORE THAN columns will be used by most operators. This permits the full use of the maximum wear allowance and a reduction in the number of parts which are rejected, is possible.

The column WORN PART DIMENSIONS (Non-select) is included for operators who want to have full interchangeability. If this column is used an increase in the number of parts which are rejected is possible.

After the part has been in service for some time the REJECT IF MORE THAN and WORN PART DIMENSIONS could be changed. The operator must tell IAE and if agreed the manual will be changed.

The abbreviation lntf shows an interference or tight fit. This causes REJECT IF MORE THAN to become REJECT IF LESS THAN.

The abbreviation clear shows a clearance fit.

This TASK gives the procedures to assemble the HP Compressor Stage 9 Cases, vanes, liners and stator vane stops. The subsequent TASKS give the procedures to assemble the remaining HP compressor rear cases and vanes.

Assemble the HP Compressor Stage 7 Cases and Stator Vanes by TASK 72-41-20-440-001-C00 (ASSEMBLY-001).

Assemble the HP Compressor Stage 8 Stator Vanes by TASK 72-41-20-440-002-C00 (ASSEMBLY-002).

Assemble the HP Compressor Stage 10 Stator Vanes by TASK 72-41-20-440-004-C00 (ASSEMBLY-004).

Assemble the HP Compressor Stage 11 Stator Vanes by TASK 72-41-20-440-005-C00 (ASSEMBLY-005).

Machine the Stator Vane Tips and the Rotor Path Ring Liners by TASK 72-41-20-440-006-C00 (ASSEMBLY-006).

Disassemble the HP Compressor Rear Cases and Vanes by TASK 72-41-20-440-007-C00 (ASSEMBLY-007).

NOTE

To identify the consumable materials refer to the PCI.

NOTE

Special tools are identified in the procedure by the tool primary number.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Heating blanketLOCAL
IAE 1R18213 Alignment checking pin0AM53IAE 1R182131
IAE 1R18501 Stop alignment tool0AM53IAE 1R185011
IAE 1R18827 Extractor0AM53IAE 1R188271
IAE 1R19685 Assembly tool0AM53IAE 1R196851
IAE 1R19689 Assembly tool0AM53IAE 1R196891
IAE 1R19690 Assembly tool0AM53IAE 1R196901
IAE 1R19691 Assembly tool0AM53IAE 1R196911

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 07-038 AIR DRYING ENAMELk3504CoMat 07-038
CoMat 10-077 APPROVED ENGINE OILSX333XCoMat 10-077

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-41-20-220-223-001 Reference Fits and Clearances of the HP Compressor Rear Cases and Vanes at Location 1177

    1. Refer to Figure.

    2. Reference dimensions at Location 1177. If required use the data written as a Note in TASK 72-41-21-200-000.

      Table 1. Fits and Clearances (all dimensions are in inches)

      NEW PART

      WORN PART

      DIMENSIONS

      DIMENSIONS

      PART IDENT

      Size

      Clearance

      (Non-select)

      REJECT IF

      MORE THAN

      LOCATION 1177

      Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800)

      Location With The Stage 9 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-650)

      Stage 10 Rotor Path Case Assembly Front Inner Bore

      21.3437

      lntf

      21.3484

      0.0020

      Stage 9 Rotor Path Case Assembly Rear Flange Outer Diameter

      21.3504

      0.0114

      21.3551

      lntf

      Table 2. Fits and Clearances (all dimensions are in millimeters)

      NEW PART

      WORN PART

      DIMENSIONS

      DIMENSIONS

      PART IDENT

      Size

      Clearance

      (Non-select)

      REJECT IF

      MORE THAN

      LOCATION 1177

      Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800)

      Location With The Stage 9 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-650)

      Stage 10 Rotor Path Case Assembly Front Inner Bore

      542.13

      lntf

      542.25

      0.050

      Stage 9 Rotor Path Case Assembly Rear Flange Outer Diameter

      542.30

      0.290

      542.42

      lntf

    2. SUBTASK 72-41-20-220-223-002 Reference Fits and Clearances of the HP Compressor Rear Cases and Vanes at Location 1193

    1. Refer to Figure.

    2. Reference dimensions at Location 1193. If required use the data written as a Note in TASK 72-41-21-200-000.

      Table 3. Fits and Clearances (all dimensions are in inches)

      NEW PART

      WORN PART

      DIMENSIONS

      DIMENSIONS

      PART IDENT

      Size

      Clearance

      (Non-select)

      REJECT IF

      MORE THAN

      LOCATION 1193

      Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800)

      Location With The Stage 9 Rotor Path Case Assembly Location Pin HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-677)

      Stage 10 Rotor Path Case Assembly Location Hole Bore

      0.1638

      Clear

      0.1709

      0.0054

      Stage 9 Rotor Path Case Assembly Location Pin Outer Diameter

      0.1580

      0.0130

      0.1584

      Clear

      Table 4. Fits and Clearances (all dimensions are in inches)

      NEW PART

      WORN PART

      DIMENSIONS

      DIMENSIONS

      PART IDENT

      Size

      Clearance

      (Non-select)

      REJECT IF

      MORE THAN

      LOCATION 1193

      Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800)

      Location With The Stage 9 Rotor Path Case Assembly Location Pin HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-677)

      Stage 10 Rotor Path Case Assembly Location Hole Bore

      4.160

      Clear

      4.340

      0.136

      Stage 9 Rotor Path Case Assembly Location Pin Outer Diameter

      4.012

      0.328

      4.024

      Clear

    3. SUBTASK 72-41-20-440-278-001 Install the Liners in the Stage 10 Rotor Path Cases

    1. Refer to Figure.

      2. Install the new HPC Ring Cases and Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-740) Stage 9 front liner 1 off, in to the slot in the rear of the Stage 9 rotor path case.

      1. Put the Stage 9 rotor path case front flange down on to a clean work surface.

      2. Use IAE 1R19689 Assembly tool 1 off to install the Stage 9 front liner. Make sure the liner touches the Stage 9 rotor path case rear face.

      3. Measure and write down a record of the Stage 9 front liner split line clearance. The split line clearance must be 0.169 in. to 0.201 in. (4.30 mm to 5.10 mm).

      3. Install the new HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 04-280) Stage 9 rear liner 1 off in to the slot in the front of the HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800).

      1. Put the Stage 10 rotor path case rear flange down on a clean work surface.

      2. Use IAE 1R19685 Assembly tool 1 off to install the Stage 9 rear liner. Make sure the liner touches the Stage 10 rotor path case front face at Location A. Refer to Figure.

      3. Measure and write down a record of the Stage 9 rear liner split line clearance. The split line clearance must be 0.047 in. to 0.079 in. (1.20 mm to 2.00 mm).

    4. SUBTASK 72-41-20-440-278-002 Install the Stator Vane Stops in the Stage 10 Rotor Path Case Assembly

    1. Refer to Figure.

      2. Install the Stage 9 stator vane stops HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-790) in the Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800).

      1. Put one of the Stage 9 stator vane stops in to position in the Stage 10 Rotor Path Case Assembly.

      2. Use the IAE 1R18501 Stop alignment tool 1 off and align the Stage 9 stator vane stop in the Stage 10 Rotor Path Case Assembly.

      3. Install a washer HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-789) and a nut HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-788) on to the Stage 9 stator vane stop.

      4. Torque the nut to 85 lbfin to 105 lbfin (10.00 Nm to 12.00 Nm).

      5. Remove the stop alignment.

      6. Install the three remaining Stage 9 stator vane stops as given in Step to Step.

    5. SUBTASK 72-41-20-440-278-003 Install the Stage 9 Stator Vanes

    1. Refer to Figure.

      2. Install the Stage 9 stop vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-350).

      1. Install the eight Stage 9 stop vanes in to the Stage 10 Rotor Path Case Assembly, at the Stage 9 stator vane stops HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-790). Engage the vanes in the Stage 10 Rotor Path Case Assembly. Install two Stage 9 stop vanes at each of the stage stator vane stops.

      2. Push each of the Stage 9 stop vanes forward until the vane platform touches the Stage 9 rear liner HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800).

      3. Install the Stage 9 stator vanes.

      1. Install the vanes in a clockwise direction. Engage each of the vanes in the Stage 10 Rotor Path Case Assembly. Make sure the platform of the first vane that is installed touches the platform of the Stage 9 stop vane. Push each subsequent vane clockwise as it is installed until the vane platforms touch.

      2. Push each vane forward until the vane platform touches the Stage 9 rear liner.

        3. Install the Stage 9 stator vanes between the two Stage 9 stop vanes adjacent to the 12 o'clock and 3 o'clock positions. Use the subsequent sequence.

        1. Install five Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        2. Install one Stage 9 undersize stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        3. Install five Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        4. Install one Stage 9 stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448).

        5. Install one Stage 9 undersize stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        6. Install five Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        7. Install one Stage 9 stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448).

        8. Install one Stage 9 undersize stator Vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        9. Install four Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

      4. Install the Stage 9 stator vanes between the two Stage 9 stop vanes adjacent to the 6 o'clock and 9 o'clock positions. Use the sequence given in Step to Step.

      5. Install the Stage 9 stator vanes between the two Stage 9 stop vanes adjacent to the 9 o'clock and 12 o'clock positions. Use the sequence given in Step to Step.

        6. Install the Stage 9 stator vanes between the two Stage 9 stop vanes adjacent to the 3 o'clock and 6 o'clock positions. Use the subsequent sequence.

        1. Install two Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        2. Install the Stage 9 LH intrascope vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-200).

          NOTE

          Make sure the borescope access hole in the Stage 9 case and intrascope vanes hole are aligned.

        3. Install the Stage 9 RH intrascope vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-250).

        4. Install four Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        5. Install one Stage 9 undersize stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        6. Install four Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        7. Install one Stage 9 stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448).

        8. Install one Stage 9 undersize stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        9. Install four Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

        10. Install one Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448).

        11. Install one Stage 9 undersize stator vane HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450).

        12. Install three Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-400).

      7. lnstall IAE 1R18213 Alignment checking pin 1 off through the Stage 10 case borescope access hole. Make sure the checking pin easily goes in to the intrascope vanes holes.

    6. SUBTASK 72-41-20-440-278-004 Install the Stage 10 Rotor Path Case Assembly

    1. Put the Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800) front flange down on to a clean work bench.

    2. Install the heating blanket on the front face of the Stage 10 Rotor Path Case Assembly.

    3. Heat the Stage 10 Rotor Path Case Assembly to 167 deg F to 212 deg F (75 deg C to 100 deg C).

    4. Remove the heating blanket.

    5. WARNING

      YOU MUST PUT ON THE CORRECT PROTECTIVE GLOVES BEFORE YOU TOUCH THE STAGE 10 ROTOR PATH CASE ASSEMBLY.

      Install the Stage 10 Rotor Path Case Assembly to the Stage 9 Rotor Path Case Assembly. Align the pin hole in the Stage 10 Rotor Path Case Assembly Front Flange with the location pin in the Stage 9 Rotor Path Case Assembly.

    6. Install eight slave nuts and bolts through the assembly joint flange. Space them at equal distances around the flange. Install the bolts from the Stage 10 Rotor Path Case Assembly front flange.

    7. Tighten the nuts in the correct sequence to pull the Stage 10 Rotor Path Case Assembly on to the Stage 9 Rotor Path Case Assembly.

    8. Let the assembly become cool then remove the eight slave nuts and bolts.

    9. Install the 47 bolts HPC Assembly HPC Assembly (72-41-00, 01-592) and nuts HPC Assembly HPC Assembly (72-41-00, 01-590) to attach the Stage 10 Rotor Path Case Assembly to the Stage 9 Rotor Path Case Assembly. Install the bolts from the Stage 9 to Stage 10 Rotor Path Case Assembly Front Flange. Torque the 47 nuts in the correct sequence to 36 lbfin to 45 lbfin (4.00 Nm to 5.00 Nm).

    7. SUBTASK 72-41-20-440-278-005 Measure the lnterplatform Clearances

    1. Refer to Figure.

      2. Measure and write down a record of the interplatform clearances at the Stage 9 stop vanes. Measure all four clearances at the same time.

      1. Push the Stage 9 stator stop vane (which is installed adjacent to the stator vane stop) in a clockwise direction.

        NOTE

        If the interplatform clearances are not correct continue with Step.

      2. Measure and write down a record of the clearance between the stop vane and the stator vane platforms, Dimension B. The dimension must be 0.083 in. to 0.098 in. (2.10 mm to 2.50 mm). Measure all four clearances at the same time, use four feeler gauges.

    8. SUBTASK 72-41-20-440-278-006 Install the Stage 9 Undersize Stator Vanes

    1. Refer to Figure, Figure and Figure.

      NOTE

      To get the specified interplatform clearance at the four Stage 9 stop vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-350) use Stage 9 undersize stator vanes.

      NOTE

      HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-450) or Stage 9 stator vanes.

      NOTE

      HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448) as necessary.

      NOTE

      A maximum of eight undersize vanes can be used between the two adjacent stop vanes. These must be set at equal distances between the stop vanes.

    2. Remove the 47 nuts and bolts which attach the Stage 9 Rotor Path Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-650) to the Stage 10 Rotor Path Case Assembly HPC Ring Cases And Related Parts HPC Ring Cases And Related Parts (72-41-21, 03-800).

      3. Remove the Stage 10 rotor path ring.

      1. Install the Heating blanket around the Stage 10 case.

      2. Heat the Stage 9 case to 167 deg F to 212 deg F (75 deg C to 100 deg C).

      3. Remove the Heating blanket.

      4. WARNING

        YOU MUST PUT ON THE CORRECT PROTECTIVE GLOVES BEFORE YOU TOUCH THE STAGE 10 ROTOR PATH RING.

        Install the plates of IAE 1R18827 Extractor 3 off on the front flange of the Stage 10 case. Refer to extractor Detail C on Figure.

      5. Adjust the bolts of the extractors to engage the pins in the extraction holes in the rear flange of the Stage 9 case.

      6. Continue to turn the bolts to remove the Stage 10 rotor path case. Equally turn the bolts by a small quantity.

    4. CAUTION

      UNDERSIZE VANES MUST NOT BE INSTALLED ADJACENT TO THE STOP VANES, INTRASCOPE VANES OR OTHER UNDERSIZE VANES.

      CAUTION

      UNDERSIZE VANES MUST NOT BE INSTALLED BETWEEN THE STAGE 9 INTRASCOPE VANES AND THE STAGE 9 STOP VANE ADJACENT TO THE 6 O'CLOCK POSITION.

      Remove the Stage 9 stator vanes HPC Stator Vanes HPC Stator Vanes (72-41-22, 04-448) and install the Stage 9 vanes as necessary. One Stage 9 undersize vane will give an increase or decrease in the interplatform clearance of 0.016 in. (0.40 mm).

    5. Install the Stage 10 Rotor Path Case Assembly as given in Step.

    6. Measure and write down a record of the interplatform clearances at the Stage 9 stop vanes as given in Step.

    9. Figure: View through the HP Compressor Rear Cases and Vanes

    View through the HP Compressor Rear Cases and Vanes

    Figure: Locations for the Fits and Clearances

    Locations for the Fits and Clearances

    Figure: Install the Stage 9 Stator Vane Front and Rear Liners

    Install the Stage 9 Stator Vane Front and Rear Liners

    Figure: Install the Stage 9 Stator Vane Stops

    Install the Stage 9 Stator Vane Stops

    Figure: Install the Stage 9 Stator Vanes

    Install the Stage 9 Stator Vanes

    Figure: Stator Vane Interplatform Clearance

    Stator Vane Interplatform Clearance

    Figure: Remove the Stage 10 Rotor Path Case

    Remove the Stage 10 Rotor Path Case

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised step. (19VG142)

Manufacturer Code:0AM53
Enterprise Name:IAE INTERNATIONAL AERO ENGINES AG
BU Name:NULL
Building:SUITE 400
Street:628 HEBRON AVENUE
City:GLASTONBURY
State:CT
Zip Code:06033
Country:USA
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:X333X
Enterprise Name:REFER TO V2500 SB ENG-79-0108
Link not Found
Manufacturer Code:00BB6
Supply Number:CoMat 07-038
Type:sp01
Supply Short Name:CoMat 07-038 AIR DRYING ENAMEL
Supply Name:CoMat 07-038 AIR DRYING ENAMEL
Specification Groups:
Doc NumberType
OMAT:7/22B (RR REF)IP9138 R1
JCR-029 (JAEC REF)
Suppliers:
ManufacturerRemarks
00BB6
K3504
Manufacturer Code:X333X
Supply Number:CoMat 10-077
Type:sp01
Supply Short Name:CoMat 10-077 APPROVED ENGINE OILS
Supply Name:CoMat 10-077 APPROVED ENGINE OILS
Specification Groups:
Doc NumberType
For V2500-A1/A5/D5 models - Refer to V2500 Service Bulletin ENG-79-0108
For V2500-E5 model - Refer to Service Bulletin E5-79-0001
Suppliers:
ManufacturerRemarks
X333X
Manufacturer Code:0AM53
Tool Number:IAE 1R18213
Tool Name:IAE 1R18213 Alignment checking pin
Manufacturer Code:0AM53
Tool Number:IAE 1R18501
Tool Name:IAE 1R18501 Stop alignment tool
Manufacturer Code:0AM53
Tool Number:IAE 1R18827
Tool Name:IAE 1R18827 Extractor
Manufacturer Code:0AM53
Tool Number:IAE 1R19685
Tool Name:IAE 1R19685 Assembly tool
Manufacturer Code:0AM53
Tool Number:IAE 1R19689
Tool Name:IAE 1R19689 Assembly tool
Manufacturer Code:0AM53
Tool Number:IAE 1R19690
Tool Name:IAE 1R19690 Assembly tool
Manufacturer Code:0AM53
Tool Number:IAE 1R19691
Tool Name:IAE 1R19691 Assembly tool
Link not Found