Removal of the Bleed Air Ducts

TASK 36-11-48-000-803-A
Removal of the Bleed Air Ducts

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 521
ZONE: 621

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QAD1)	Wire-- Stainless Steel Braided -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
521	INBOARD FIXED L.E STRUCTURE
621	INBOARD FIXED L.E STRUCTURE
521AB, 521BB, 521BT, 521CB, 521EB, 621AB, 621BB, 621BT, 621CB, 621EB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-92-00-000-804-A	Removal of the Pylon Power Feeder-Cables
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-80-00-866-004-A	Extending the Slats on the Ground
TASK 30-11-51-000-001-A	Removal of the Wing Anti-Ice Control-Valve
TASK 36-11-17-000-001-A	Removal of the Heat-Exchanger Outlet-Temperature Sensor
TASK 57-41-37-000-004-A	Removal of the Pressure Relief Panels
TASK 57-41-37-000-005-A	Removal of the NACA Duct Panel
TASK 57-41-37-000-009-A	Removal of the Access Panel
Bleed Air Ducts from the Fuselage to Slat Track 1
Bleed Air Ducts from Slat Track 1 to the Intermediate Rib
Bleed Air Ducts from the Intermediate Rib to the Closing Rib
Bleed Air Ducts from the Closing Rib to the Pylon - LH Wing
Bleed Air Ducts from the Closing Rib to the Pylon - RH Wing
Bleed Air Ducts from the Pylon to the Anti Ice Valve

3. Job Set-up
Subtask 36-11-48-941-062-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) On AIR COND overhead-panel 30VU, put the WARNING NOTICE(S) in position to tell persons not to operate the pneumatic systems.

Subtask 36-11-48-860-067-A

B. Aircraft Maintenance Configuration

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Fully extend the slats (Ref. AMM TASK 27-80-00-866-004).
(2) On center pedestal panel 114VU:
(a) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
(b) Put the WARNING NOTICE(S) in position to tell persons not to operate the flap/slat controls.

Subtask 36-11-48-865-077-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B01
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-48-010-065-A

D. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable access panels.
(2) Remove the applicable access panels:
(a) For the left wing:

(b) For the right wing:

4. Procedure
Subtask 36-11-48-020-091-A

A. Removal of the Bleed Air Ducts between the Fuselage and Slat Track 1

Bleed Air Ducts from the Fuselage to Slat Track 1

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Cut, remove and discard the Wire-- Stainless Steel Braided - (Material No.14QAD1) from the insulation muffs (2) and (7).
(2) Remove the insulation muffs (2) and (7).
(3) Remove the clamps (4) and (6).
(4) Remove the bleed air duct (5) from the aircraft.
(5) Remove the nut (12), insulation washer (13), facing washer (11) and the bolt (14).
(6) Remove the insulation washer (9) and the facing washer (8) from the bolt (14).
(7) Disconnect the link assembly (10) from the bleed air duct (1).
(8) Remove the clamp (3).
(9) Remove the bleed air duct (1) from the aircraft.
(10) Install a PLUG - BLANKING on the bleed air duct in the fuselage.

Subtask 36-11-48-020-092-A

B. Removal of the Bleed Air Ducts between Slat Track 1 and the Intermediate Rib

Bleed Air Ducts from Slat Track 1 to the Intermediate Rib

(1) Remove the duct assembly (60) before you remove the bleed air ducts between slat track 1 and the intermediate rib.

Bleed Air Ducts from the Intermediate Rib to the Closing Rib

(2) Cut, remove and discard the Wire-- Stainless Steel Braided - (Material No.14QAD1) from the insulation muffs (22), (36) and (42).
(3) Remove the insulation muffs (22), (36) and (42).
(4) Remove the nut (23), the washer (24) and the screw (17). Disconnect the bonding leads (25) and (18) from the duct assembly (16).
(5) Remove the nut (33), the washer (34) and the screw (26). Disconnect the bonding lead (25) from the duct assembly (28).
(6) Remove the nut (30), the washer (31) and the screw (29). Disconnect the bonding lead (32) from the duct assembly (28).
(7) Remove the nut (53), the washer (54) and the screw (38). Disconnect the bonding lead (32) from the connector assembly (40).
(8) Remove the nut (52), the washer (51) and the screw (39). Disconnect the bonding lead (47) from the connector assembly (40).
(9) Remove the nut (45), the washer (46) and the screw (43). Disconnect the bonding leads (44) and (47).
(10) Remove the bolts (48), the facing washers (49) and the insulation washers (50).
(11) Remove the connector assembly (40).
(12) Remove and discard the two piece seals (37) and (41) from the connector assembly (40).
(13) Remove the nuts (57) and the bolts (55).
(14) Remove the rib assembly (56).
(15) Carefully remove the duct assembly (28) and the tube assembly (27) from the aircraft.
(16) Remove and discard the two piece seal (35) from the duct assembly (28).
(17) Remove the bolts (21), the facing washers (20) and the insulation washers (19).
(18) Remove the duct assembly (16) and the tube assembly (15) from the aircraft.

Subtask 36-11-48-020-093-A

C. Removal of the Bleed Air Ducts between the Intermediate Rib and the Closing Rib

Bleed Air Ducts from the Intermediate Rib to the Closing Rib

(1) Remove the bleed air ducts between slat track 1 to the intermediate rib before you remove the bleed air duct (64).

(2) Cut, remove and discard the Wire-- Stainless Steel Braided - (Material No.14QAD1) from the insulation muffs (62) and (71).
(3) Remove the insulation muffs (62) and (71).
(4) Remove the clamps (58) and (61).
(5) Remove the duct assembly (60) and the sleeve assembly (59) from the aircraft.
(6) Remove the nut (68), the washer (67) and the screw (66). Disconnect the bonding lead (69) from the duct assembly (64).
(7) Remove the nut (73), the washer (74) and the screw (72). Disconnect the bonding leads (69) and (75) from the duct assembly (84).

Bleed Air Ducts from the Closing Rib to the Pylon - LH Wing

Bleed Air Ducts from the Closing Rib to the Pylon - RH Wing

(8) Carefully move the duct assembly (64) through the tube assemblies (65) and (63) and remove the duct assembly (64) from the aircraft.
(9) Remove and discard the two piece seal (70) from the duct assembly (64).

Subtask 36-11-48-020-094-A

D. Removal of the Bleed Air Ducts between the Closing Rib and the Pylon

Bleed Air Ducts from the Closing Rib to the Pylon - LH Wing

Bleed Air Ducts from the Closing Rib to the Pylon - RH Wing

(1) Cut, remove and discard the Wire-- Stainless Steel Braided - (Material No.14QAD1) from the insulation muffs (88) and (98).
(2) Remove the insulation muffs (88) and (98).
(3) Remove the temperature sensor (103) from the bleed air duct (89) (Ref. AMM TASK 36-11-17-000-001).
(4) For the right wing only, do these steps:

Bleed Air Ducts from the Closing Rib to the Pylon - RH Wing

(a) If necessary, disconnect the Integrated Drive Generator (IDG) cables for better access to the bleed air duct (Ref. AMM TASK 24-92-00-000-804).
(b) Remove the nuts (115) and the bolts (110).
(c) Remove the nuts (116), the washers (117) and the bolts (109).
(d) Remove the nuts (114) and the bolts (112).
(e) Carefully put the cable carrier (111) in position to allow access for removal of the bracket (113).
(f) Remove the bracket (113).

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

(5) Remove and discard the cotter pins (105).
(6) Remove the nuts (106), the washers (107) and the bolts (108).
(7) Disconnect the structural rods (90), (91) and (92).
(8) Remove the clamps (87), (104) and (102).
(9) Carefully remove the duct assembly (89) from the aircraft.
(10) Remove the nuts (86), the washers (85) and (77) and the bolts (76).
(11) Remove the cable support bracket (78).
(12) Remove the nuts (79), bolts (83), facing washers (82) and the insulation washers (81).
(13) Carefully remove the duct assembly (84) and the insulation gasket (80).
(14) Install a PLUG - BLANKING on the pre cooler duct.
(15) Remove the nut (101), the washer (100) and the screw (93).
(16) Remove the bonding lead (99) from the duct assembly (94).
(17) Remove the duct assembly (94) from the aircraft.
(18) Remove the flexible connector (96) from the duct assembly (123).

Bleed Air Ducts from the Pylon to the Anti Ice Valve

(19) Remove and discard the seals (95) and (97).

Subtask 36-11-48-020-095-A

E. Removal of the Bleed Air Ducts between the Pylon and the Anti Ice Valve

Bleed Air Ducts from the Pylon to the Anti Ice Valve

(1) Remove the anti ice valve from the duct assembly (130) (Ref. AMM TASK 30-11-51-000-001).

(2) Cut, remove and discard the Wire-- Stainless Steel Braided - (Material No.14QAD1) from the insulation muff (128).
(3) Remove the insulation muff (128).
(4) Remove the nut (122), the washer (121) and the bolt (118).
(5) Remove the bonding leads (120) and (119) from the duct assembly (123).
(6) Remove the nuts (135), the washers (136) and the bolts (137) from the link assemblies.
(7) Remove the nuts (134), the washers (133) and (132) and the screws (131).
(8) Remove the half clamps (138) and (139) and the link assemblies.
(9) Loosen the vapor seal (129) from the duct assembly (130).
(10) Remove the clamp (127).
(11) Carefully remove the duct assembly (130) from the aircraft.
(12) Remove the bolts (126) the washers (125) and the insulation gasket (124).
(13) Remove the duct assembly (123) from the aircraft.

[Rev.10 from 2021] 2026.04.01 01:09:46 UTC