Detailed Inspection of the LH and RH Wing Leading Edge Overheat Sensing Elements

TASK 36-22-16-200-001-A
Detailed Inspection of the LH and RH Wing Leading Edge Overheat Sensing Elements

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: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

WARNING: DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS.

1. Reason for the Job
Detailed inspection of the bleed air duct leak/sensing element detection system, for example, after a duct leak warning.
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	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191CT, 191EB, 192CT, 192EB, 521AB, 521BB, 521BT, 521CB, 521EB, 521GB, 521HB, 522AB, 522AT, 522CB, 522EB, 522FB, 621AB, 621BB, 621BT, 621CB, 621EB, 621GB, 621HB, 622AB, 622AT, 622CB, 622EB, 622FB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 27-80-00-866-004-A	Extending the Slats on the Ground
TASK 27-80-00-866-005-A	Retracting the Slats on the Ground
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 53-35-11-000-001-A	Removal of the Wing-to-Fuselage Fairings
TASK 53-35-11-400-001-A	Installation of the Wing-to-Fuselage Fairings
TASK 57-41-37-000-003-A	Removal of the Access Panel
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 57-41-37-000-006-A	Removal of the Access Panels
TASK 57-41-37-400-002-A	Installation of the Pressure Relief Panels
TASK 57-41-37-400-003-A	Installation of the Access Panel
TASK 57-41-37-400-005-A	Installation of the NACA Duct Panel
TASK 57-41-37-400-006-A	Installation of the Access Panels
Overheat Sensing Elements and Cables - Access Panels
Overheat Sensing Elements
Overheat Sensing Element - Typical Installation
Permitted Tolerances of the Sensing Elements

3. Job Set-up
Subtask 36-22-16-941-065-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to operate the slat controls.
(3) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).

Subtask 36-22-16-860-080-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Extend the slats fully (Ref. AMM TASK 27-80-00-866-004).

Subtask 36-22-16-865-080-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-22-16-010-058-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the applicable access panels.
(2) Remove the applicable access panels (Ref. AMM TASK 57-41-37-000-004), (Ref. AMM TASK 57-41-37-000-006), (Ref. AMM TASK 57-41-37-000-005), (Ref. AMM TASK 57-41-37-000-003) and (Ref. AMM TASK 53-35-11-000-001):

for the LH wing, remove 191CT 191EB 521AB 521BB 521BT 521CB 521EB 521GB 521HB 522AB 522AT 522CB 522EB 522FB
for the RH wing, remove 192CT 192EB 621AB 621BB 621BT 621CB 621EB 621GB 621HB 622AB 622AT 622CB 622EB 622FB.

4. Procedure
Subtask 36-22-16-210-065-A ** ON A/C NOT FOR ALL

A. Inspection of the Overheat Sensing Elements
(1) Make sure that the clearance between the sensing elements and the duct is a minimum of 12.7 MM (0.50 IN.), measured along the full length of the sensing element.
(2) Do an inspection of the sensing elements to make sure that they are installed on the outer side of the insulation.
(3) Make sure that the clearance between the sensing elements and the duct insulation is the same as at the mounting brackets.
(4) Make sure that the sensing elements are installed in the permitted tolerances.
(5) Make sure that each clamp has a silicon rubber grommet.
(6) Make sure that each mounting bracket, installed on the duct, has a spacer.
(7) Make sure that the sensing elements are installed correctly.
(8) Make sure that each mounting clamp is in the correct condition and has no corrosion.
(9) Make sure that the bonding straps are correctly attached (Ref. AMM TASK 20-28-00-912-802).
(10) Make sure that the lockwires are correctly installed on the connections of the sensing elements.
(11) Make sure that the duct insulation is in the correct condition and correctly installed.
(12) Make sure that the sensing elements have no cracks, nicks, sharp edges, bonds chafing or corrosion.

5. Close-up
Subtask 36-22-16-410-059-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable access panels (Ref. AMM TASK 57-41-37-400-002), (Ref. AMM TASK 57-41-37-400-006), (Ref. AMM TASK 57-41-37-400-005), (Ref. AMM TASK 57-41-37-400-003) and (Ref. AMM TASK 53-35-11-400-001):

for the LH wing, install 191CT 191EB 521AB 521BB 521BT 521CB 521EB 521GB 521HB 522AB 522AT 522CB 522EB 522FB
for the RH wing, install 192CT 192EB 621AB 621BB 621BT 621CB 621EB 621GB 621HB 622AB 622AT 622CB 622EB 622FB.

Subtask 36-22-16-865-081-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-22-16-860-081-A ** ON A/C NOT FOR ALL

C. Aircraft Configuration
(1) Retract the slats fully (Ref. AMM TASK 27-80-00-866-005).

Subtask 36-22-16-942-058-A ** ON A/C NOT FOR ALL

D. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 01:17:16 UTC