TASK 70-37-01-370-501 Stress-Relief Cycle 12A

DMC:V2500-00-70-37-01-00A-634A-D|Issue No:001.00|Issue Date:2013-03-20

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 70-37-01-370-501 Stress-Relief Cycle 12A

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS. THESE CONTAIN INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS IN TO CONSIDERATION.

Procedure

    1. SUBTASK 70-37-01-370-001 Stress-Relief Cycle 12A

    1. NOTE

      Cycle 12A increases and decreases the temperature gradually to keep to a minimum the distortion of parts in which sudden temperature changes can cause distortion.

      NOTE

      If a repair task specifies to use Cycle 12 (Refer to the SPM TASK 70-37-29-370-501), then it is permitted to use Cycle 12A as an alternative to Cycle 12.

      NOTE

      If a repair task specifies to use Cycle 12A, but does not specify to use Cycle 12 (Refer to the SPM TASK 70-37-29-370-501), then it is not permitted to use Cycle 12 as an alternative to Cycle 12A.

      Put the part in a cold oven. Air is a permitted atmosphere.

    2. Increase the temperature of the part to 600 deg F (316 deg C) and hold for 30 minutes.

    3. Increase the temperature of the part to 800 deg F (427 deg C) and hold for 30 minutes.

    4. Increase the temperature of the part to 1000 deg F (538 deg C) and hold for 30 minutes.

    5. Increase the temperature of the part to 1200 deg F (649 deg C) and hold for 30 minutes.

    6. Increase the temperature of the part to 1325 to 1375 deg F (718 to 746 deg C) and hold for four hours.

    7. Decrease the temperature of the part to 1175 to 1225 deg F (635 to 663 deg C) at a rate not faster than 125 deg F (70 deg C) for each hour and hold for a time which, together with cooling time from 1350 deg F (732 deg C), totals three hours.

    8. Decrease the temperature of the part to 500 deg F (260 deg C) at a rate not faster than 100 deg F (56 deg C) for each 15 minutes. Subsequent temperature decrease rate is optional.

      .

Requirements After Job Completion

Follow-On Conditions

NONE