Hot Air Leakage Detected

TASK 30-21-00-810-829-A
Hot Air Leakage Detected

1. Possible Causes

forward NAI duct
THERMOCOUPLE ASSEMBLY, OVERHEAT INDICATION, FAN CASE [4160KS]
W04 HARNESS [4088KS]
W03 HARNESS [4087KS]
[4000KS]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

REFERENCE	DESIGNATION
AMM 30-21-24-000-801	Removal of the Nacelle Anti-Ice Fan Case Thermocouple
AMM 30-21-24-400-801	Installation of the Nacelle Anti-Ice Fan Case Thermocouple
AMM 30-21-49-000-807	Removal of the Nacelle Anti-Ice (NAI) Duct
AMM 30-21-49-220-801	Detailed Visual Inspection of the Engine Air-Intake Ice-Protection Ducts
AMM 30-21-49-400-807	Installation of Nacelle Anti-Ice (NAI) Duct
AMM 71-13-00-010-802	Opening of the Fan Cowl Doors
AMM 71-13-00-410-802	Closing of the Fan Cowl Doors
AWM 715134
AMM 73-21-01-000-801	Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801	Installation of the Electronic Engine Control (EEC)
AMM 73-21-63-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-64-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-64-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)

3. Fault Confirmation
Subtask 30-21-00-730-066-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

Subtask 30-21-00-810-078-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the right fan cowl-door AMM 71-13-00-010-802.
(2) Make sure that electrical connector 4113VC-A of the NAI thermocouple-assembly overheat is correctly engaged in 4113VC of the W04 harness.
(a) If it is not correctly engaged, engage it.

After the subsequent flight, make sure that the fault does not continue.

(3) Do a visual inspection of the forward NAI duct for discoloration, loose or damaged interfaces or damage along the length of the duct AMM 30-21-49-220-801.
(a) If you find discoloration, loose or damaged interfaces or damage on the forward NAI duct:

Replace the forward NAI duct AMM 30-21-49-000-807 and AMM 30-21-49-400-807.
After the subsequent flight, make sure that the fault does not continue.

(b) If the fault continues, or if electrical connector 4113VC-A is correctly engaged, disconnect electrical connector 4113VC-A from electrical connector 4113VC.

Examine electrical connector 4113VC-A for bent pins, contamination, corrosion or visual signs of damage.

1 If you find damage on electrical connector 4113VC-A:

Replace the THERMOCOUPLE ASSEMBLY, OVERHEAT INDICATION, FAN CASE [4160KS] AMM 30-21-24-000-801 and AMM 30-21-24-400-801.
After the subsequent flight, make sure that the fault does not continue.

2 If you find no damage on electrical connector or the fault continues, do a resistance check of the thermocouple 1 and 2 AWM 715134 between:
. Pin 4113VCA/4 and pin 4113VCA/12 of the NAI thermocouple assembly overheat
. Pin 4113VCA/6 and pin 4113VCA/7 of the NAI thermocouple assembly overheat.
a If the resistance is more than 250 ohm:

Replace THERMOCOUPLE ASSEMBLY, OVERHEAT INDICATION, FAN CASE [4160KS] AMM 30-21-24-000-801 and AMM 30-21-24-400-801.
After the subsequent flight, make sure that the fault does not continue.

b If the resistance is less than 250 ohm:

Do a resistance check AWM 715134 between:
. Pin 4113VCA/3 and pin 4113VCA/11 of RTD 1
. Pin 4113VCA/8 and pin 4113VCA/9 of RTD 2.
* If the resistance is more than 250 ohm:
Replace the THERMOCOUPLE ASSEMBLY, OVERHEAT INDICATION, FAN CASE [4160KS] AMM 30-21-24-000-801 and AMM 30-21-24-400-801.
After the subsequent flight, make sure that the fault does not continue.

* If the resistance is less than 250 ohm:
Use PLIERS - JAWED, SOFT to disconnect electrical connectors P13 and P5 from the EEC:
Examine electrical connectors of P13 and P5 for bent pins, contamination or corrosion or visual signs of damage.
If you find damage on the electrical connectors:
Replace the W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
After the subsequent flight, make sure that the fault does not continue.

If you find no damage on the electrical connectors:
Do a continuity check of the W04 harness AWM 715134 between:
. Pin P13/m of the EEC and pin J55/12 of the 4113VC
. Pin P13/k of the EEC and pin J55/4 of the 4113VC
. Pin P5/M of the EEC and pin J55/3 of the 4113VC
. Pin P5/N of the EEC and pin J55/11 of the 4113VC.
If there is no continuity:
Replace the W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
After the subsequent flight, make sure that the fault does not continue.

If there is continuity:
Use PLIERS - JAWED, SOFT to disconnect electrical connectors P14 and P6 from the EEC:
Examine electrical connectors of P14 and P6 for bent pins, contamination or corrosion or visual signs of damage.
If you find damage on the electrical connectors:
Replace the W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
After the subsequent flight, make sure that the fault does not continue.

If you find no damage on the electrical connectors:
Do a continuity check AWM 715134 of the W03 harness between:
. Pin P14/m of the EEC and pin P107/42 of the 4101VC
. Pin P14/k of the EEC and pin P107/43 of the 4101VC
. Pin P6/M of the EEC and pin P107/44 of the 4101VC
. Pin P6/N of the EEC and pin P107/45 of the 4101VC.
If there is no continuity:
Replace the W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
After the subsequent flight, make sure that the fault does not continue.

If there is continuity:
Do a continuity check of the W04 harness AWM 715134 between:
. Pin J107/42 of the 4101VC and pin J55/7 of the 4113VC
. Pin J107/43 of the 4101VC and pin J55/6 of the 4113VC
. Pin J107/44 of the 4101VC and pin J55/8 of the 4113VC
. Pin J107/45 of the 4101VC and pin J55/9 of the 4113VC.

If there is no continuity:
Replace the W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
After the subsequent flight, make sure that the fault does not continue.

(4) If the fault continues:

Replace the [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
After the subsequent flight, make sure that the fault does not continue.

5. Close-up
Subtask 30-21-00-942-070-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the right fan cowl-door AMM 71-13-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:29:33 UTC