Hot Air Leaks on Engine 2

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1. Possible Causes
· engine air ducts
· SENSOR-NACELLE TEMPERATURE ( 4008KS )
· EIU-2 ( 1KS2 )
· wiring from the pin AA/10B of the EIU 2 (1KS2) to the pin A/1 of the nacelle temperature sensor (4008KS)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. ASM 73-25-07
Ref. AMM 73-25-34-000-041 Removal of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-400-041 Installation of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-710-042 Operational Test of the EIU with the CFDS
REFERENCE DESIGNATION
Ref. AMM 75-21-00-200-010 Check Zone 1 Ventilation Inlet and Exit for Blockage
Ref. AMM 75-21-00-200-011 Check Zone 2 Ventilation Intake Holes (in Thrust Reverser C-Ducts)
and Exit for Blockage
Ref. AMM 75-41-15-000-010 Removal of the Nacelle Temperature Sensor
Ref. AMM 75-41-15-400-010 Installation of the Nacelle Temperature Sensor
3. Fault Confirmation
Subtask 75-41-00-710-052-A
A. Test
(1) Do the operational test of the EIU 2 with the CFDS Ref. AMM 73-25-34-710-042 .
4. Fault Isolation
Subtask 75-41-00-810-051-A
A. If the operational test gives the maintenance message CHECK HOT AIR LEAKS ENG2:
· examine the engine air ducts for leakage Ref. AMM 75-21-00-200-010 and Ref.
AMM 75-21-00-200-011 .
(1) If the fault continues:
· replace the SENSOR-NACELLE TEMPERATURE ( 4008KS ) , Ref. AMM 75-41-15-000-010 and
Ref. AMM 75-41-15-400-010 .
(2) If the fault continues:
· replace the EIU-2 ( 1KS2 ) , Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(3) If the fault continues:
· do a check and repair the wiring from the pin AA/10B of the EIU 2 (1KS2) to the pin A/1 of the
nacelle temperature sensor (4008KS) , Ref. ASM 73-25-07.
Subtask 75-41-00-710-053-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:37:18 UTC