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 77-21-15-200-401 EGT Thermocouple - Related Parts - Examine The EGT Thermocouple, Inspection-001
General
This TASK gives the procedure for the inspection of the EGT Thermocouple.
Fig/item numbers in parentheses in the procedure agree with those used in the IPC.
The policy that is necessary for inspection is given in SPM 70-22-00-200-501.
All the parts must be cleaned before any part is examined. Refer to TASK 77-21-15-100-400 (Cleaning-000).
All parts must be visually examined for damage, corrosion and wear. Any defects that are not identified in the procedure must be referred to IAE.
Do not discard any part until you are sure there are no repairs available. Refer to the instructions in Repair before a discarded part is used again or oversize parts are installed.
Parts which should be discarded can be held although no repair is available. The repair of a discarded part could be shown to be necessary at a later date.
All parts must be examined to make sure that all the repairs have been completed satisfactorily.
The practices and processes referred to in the procedure by the TASK numbers are in SPM.
References
Refer to SPM for data on these items:
Definitions of Damage, SPM TASK 70-02-02-350-501.
Inspection of Parts, SPM TASK 70-20-01-200-501.
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
NONEConsumables, Materials and Expendables
NONESpares
NONESafety Requirements
NONEProcedure
Refer to Figure.
Clean by TASK 77-21-15-100-401 (Cleaning-001).
Unwanted particles.
Reject.
Cracks, damage.
Reject.
Damaged threads.
SUBTASK 77-21-15-220-051 Examine the EGT Thermocouple (01-100)
Use an approved marker to make a witness mark from the 12 o'clock position of the stud to the top of the housing.
Attach the nuts to the thermocouple terminal studs. Refer to TASK 72-00-50-450-001 (Installation-010).
Use a torque wrench that is set to 22 lbfin (2.486 Nm) to torque the nuts on the alumel (larger) studs. If the witness mark moves, reject the probe.
Use a torque wrench that is set to 18 lbfin (2.034 Nm) to torque the nuts on the chromel (smaller) studs. If the witness mark moves, reject the probe.
SUBTASK 77-21-15-220-052 Examine the EGT Thermocouple Terminal Studs for Looseness
CAUTION
DO NOT USE LUBRICATION ON THE THREADS OF THE THERMOCOUPLE CONNECTIONS. ENGINE OIL CAN CONTAMINATE THE EGT HARNESS INSULATION MATERIAL AND RESULT IN ERRATIC OR UNRELIABLE EGT INDICATION.
Figure: Exhaust Gas Temperature Thermocouple
Exhaust Gas Temperature Thermocouple
