Removal of the Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines

TASK 30-21-11-000-801-A
Removal of the Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

FIN: 4002DN
FIN: 4003DN

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	PLIERS - JAWED, SOFT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines
LPTACC Duct and Bracket, Elbow Duct and Pylon Drain Line

3. Job Set-up
Subtask 30-21-11-941-050-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 30-21-11-865-050-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-11-010-050-A

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 30-21-11-040-050-A

D. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 30-21-11-010-051-A

E. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
(3) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 30-21-11-020-050-A

A. Removal of the Nacelle Anti-Ice (NAI) Pressure Sensors and Sense Lines
(1) Disconnection of the electrical connector

CAUTION: USE ONLY SOFT-JAW PLIERS. METAL-JAW PLIERS CAN MAKE THE ELECTRICAL CABLE UNSERVICEABLE.

(a) Use PLIERS - JAWED, SOFT to disconnect the electrical connector (8) from the forward NAI pressure-sensor (sensor) (7).
(2) Remove the sensor (7) as follows:
(a) Remove the two bolts (6) that attach the sensor (7) to the bracket (9).
(b) Remove the sensor (7) from the nacelle.
(3) Remove the tube (4) as follows:
(a) Loosen the coupling nut to disconnect the tube (4) from the sensor (7).
(b) Loosen the coupling nut to disconnect the tube (4) from the Nacelle Anti-Icing (NAI) duct (2).
(c) Remove the bolt (3) that attaches the P-clamp (5) to the bracket (1).
(d) Remove the tube (4) from the nacelle.
(4) Disconnection of the electrical connector

CAUTION: USE ONLY SOFT-JAW PLIERS. METAL-JAW PLIERS CAN MAKE THE ELECTRICAL CABLE UNSERVICEABLE.

(a) Use PLIERS - JAWED, SOFT to disconnect the electrical connector (20) from the aft NAI pressure-sensor (sensor) (11).
(5) Remove the sensor (11) as follows:
(a) Remove the two bolts (10) that attach the sensor (11) to the bracket (21).
(b) Remove the sensor (11) from the nacelle.
(6) Remove the tube (12) as follows:
(a) Loosen the coupling nut to disconnect the tube (12) from the sensor (11).
(b) Loosen the coupling nut to disconnect the tube (12) from the tube (18).
(c) Remove the bolt (14) that attach the P-clamp (13) to the bracket (19).
(d) Remove the bolt (15) that attaches the P-clamp (16) to the bracket (17).
(e) Remove the tube (12) from the nacelle.
(7) Remove the tube (18) as follows:
(a) Loosen the coupling nut to disconnect the tube (28) from the tube (18).
(b) Remove the bolt (26) that attaches the integral bracket on the tube (18) to the bracket (27).
(c) Remove the bolt (25) that attaches the P-clamp (24) to the bracket (21).
(d) Remove the bolt (23) that attaches the P-clamp (22) to the bracket (21).
(e) Remove the tube (18) from the nacelle.
(8) Remove the tube (28) as follows:
(a) Loosen the coupling nut to disconnect the tube (40) from the tube (28).
(b) Remove the bolt (42) that attaches the P-clamp (43) to the bracket (41).
(c) Remove the tube (28) from the nacelle.
(9) Remove the tube (40) as follows:
(a) Loosen the coupling nut to disconnect the tube (49) from the tube (40).
(b) Remove the bolt (45) that attaches the P-clamp (46) to the bracket (44).
(c) Remove the bolt (39) that attaches the P-clamp (47) to the bracket (38).
(d) Remove the tube (40) from the nacelle.
(10) Remove the tube (49) as follows:
(a) Loosen the coupling nut to disconnect the tube (49) from the tube (51).
(b) Remove the bolt (37) that attaches the P-clamp (48) to the bracket (36).
(c) Remove the tube (49) from the nacelle.
(11) Remove the tube (51) as follows:
(a) Loosen the hose clamps (56) and (57) to remove the elbow duct (55) from the valve (82) and High Pressure Turbine Active Clearance Control (HPTACC) air manifold (83).
(b) Loosen the hose clamps (59), (60) and (61) to remove the Low Pressure Turbine Active Clearance Control (LPTACC) duct (58).
(c) Loosen the hose clamps (63), (64) and (65) to remove the wye duct (62).
(d) Remove the two bolts (67) that attach the LPTACC support bracket (66).
(e) Remove the bolt (68) that attaches the LPTACC support bracket (66).
(f) Remove the bolt (69) that attaches the LPTACC support bracket (66).
(g) Loosen the B-nuts (71) and (72) that attach the drain line (70) to the tube (88) and drain-pylon tube (89).
(h) Remove the bolt (73) that attaches the P-clamp (74) to the support bracket (75).
(i) Remove the bolt (76) that attaches the P-clamp (77) to the support bracket (78).
(j) Remove the bolt (79) that attaches the P-clamp (80) to the support bracket (81).
(k) Remove the drain line (70) from the engine.
(l) Loosen the coupling nut to disconnect the tube (54) from the tube (51).
(m) Remove the bolt (30) that attaches the P-clamp (29) to the bracket (31).
(n) Remove the bolt (35) that attaches the P-clamp (50) to the bracket (34).
(o) Remove the bolt (32) that attaches the P-clamp (52) to the bracket (33).
(p) Remove the tube (51) from the nacelle.
(12) Remove the tube (54) as follows:
(a) Loosen the coupling nut to disconnect the tube (54) from the NAI tube (53).
(b) Remove the tube (54) from the nacelle.
(13) Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

[Rev.10 from 2021] 2026.04.01 08:20:08 UTC