the Two NAI Valves High-Pressure

TASK 30-21-00-810-830-A
the Two NAI Valves High-Pressure

1. Possible Causes

NACELLE ANTI-ICE UPPER VALVE AND ATTACHMENT HARDWARE [4010DN]
NACELLE ANTI-ICE LOWER VALVE AND ATTACHMENT HARDWARE [4011DN]
PRESS XDCR-ENGINE AIR INTAKE ANTI ICE, 2 [4003DN]
W04 HARNESS [4088KS]
[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 30-21-23-000-801	Removal of the Nacelle Anti-Ice Fan-Pressure-Transducer
AMM 30-21-23-400-801	Installation of the Nacelle Anti-Ice Fan-Pressure-Transducer
AMM 30-21-51-000-802	Removal of the Upper Anti-Ice Valve
AMM 30-21-51-000-803	Removal of the Lower Anti-Ice Valve
AMM 30-21-51-400-802	Installation of the Upper Anti-Ice Valve
AMM 30-21-51-400-803	Installation of the Lower Anti-Ice Valve
AMM 71-13-00-010-802	Opening 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 73-21-64-000-802	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)
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors

3. Fault Confirmation
Subtask 30-21-00-730-067-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 30-21-00-810-079-A ** ON A/C NOT FOR ALL

A. Open the right fan cowl-door AMM 71-13-00-010-802.

Replace the NACELLE ANTI-ICE UPPER VALVE AND ATTACHMENT HARDWARE [4010DN] AMM 30-21-51-000-802 and AMM 30-21-51-400-802, and replace the NACELLE ANTI-ICE LOWER VALVE AND ATTACHMENT HARDWARE [4011DN] AMM 30-21-51-000-803 and AMM 30-21-51-400-803.
After the subsequent flight, make sure that the fault does not continue.

(1) If the fault continues:

Disconnect electrical connector P17 from the NAI fan pressure-transducer (4003DN).
Do a visual inspection of electrical receptacle J17 of the fan pressure-transducer for bent pins, contamination, corrosion or signs of damage.

(a) If you find damage on the receptacle J17:

Replace PRESS XDCR-ENGINE AIR INTAKE ANTI ICE, 2 [4003DN] AMM 30-21-23-000-801 and AMM 30-21-23-400-801.
After the subsequent flight, make sure that the fault does not continue.

(b) If you find no damage on the receptacle J17:

Do a visual inspection of the electrical connector P17 of the W04 harness for bent pins, contamination, corrosion or signs of damage.

1 If you find damage on electrical connector P17:

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.

2 If you find no damage on the receptacle J17 and on the electrical connector P17:

Do a resistance check AWM 715134 between:
* Pin J17/4 and pin J17/12 of the NAI fan pressure transducer (4003DN)
* Pin J17/3 and pin J17/11 of the NAI fan pressure transducer (4003DN).

a If the resistance is more than 12.5 kohm:

Replace PRESS XDCR-ENGINE AIR INTAKE ANTI ICE, 2 [4003DN] AMM 30-21-23-000-801 and AMM 30-21-23-400-801.
After the subsequent flight, make sure that the fault does not continue.

b If the resistance is less than 12.5 kohm:

Use PLIERS - JAWED, SOFT to disconnect electrical connector P13 from the EEC.
Do a visual inspection of electrical connector P13 of the W04 harness for bent pins, contamination, corrosion or signs of damage.

c If you find damage on electrical connector P13:

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.

(2) 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.

Subtask 30-21-00-810-184-A ** ON A/C NOT FOR ALL

B. Contact UTAS for more instructions on the air-intake cowl.

5. Close-up
Subtask 30-21-00-942-071-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 thrust-reverser cowl-door AMM 78-36-00-410-802.

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