TASK 71-00-00-810-018 N1 Overspeed, Fault Isolation-018

DMC:V2500-A0-71-00-0000-09A-421A-B|Issue No:001.00|Issue Date:2014-05-01

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 71-00-00-810-018 N1 Overspeed, Fault Isolation-018

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. N1 Overspeed

      1. Do the necessary overspeed inspection.

        1. For an overspeed of 100% N1 (redline = 5465 RPM) to 101.4% N1 do the steps that follow before the engine is operated again.

        1. Do a check to make sure the rotors are free to move.

        2. Do a visual inspection for unwanted material in the gas path.

        3. If there is no damage, continue to use the engine after you correct the cause of the overspeed and the ground run is satisfactory.

        4. If there is damage, do an inspection by the instructions in the engine manual.

        2. For an overspeed of 101.5% N1 to 102.9% N1 do the step that follows.

        1. You can continue to use the engine for 60 hours after you do an inspection by the instructions given in A.(1). You can continue to operate the engine for more than 60 hours on the condition that the incident is examined by IAE.

        3. For an overspeed of 103% N1 or more do the step that follows.

        1. You must remove and disassemble the engine and do a complete inspection of the very important rotating parts.

    2. Check the EEC fault messages and do the necessary procedures to correct the defects. Refer to TASK 71-00-00-810-000for the EEC fault messages.

    3. Check the bleed valve operation. Refer to TASK (TBD).

      NOTE

      No procedure is necessary for a transient overspeed in this band that is not more than 5 seconds.

Requirements After Job Completion

Follow-On Conditions

NONE