Detailed Inspection of the Wing Loop (Belly Fairing) Overheat Sensing Elements

TASK 36-22-18-200-803-A
Detailed Inspection of the Wing Loop (Belly Fairing) Overheat Sensing Elements

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

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 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
147AB, 147EB, 147FB, 151BW, 151CW, 191BB, 191EB, 191JB, 192EB, 192FB, 192KB, 196AB, 197BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 25-55-11-000-001-A	Removal of the Aft Cargo-Compartment Partition at FR47
TASK 25-55-11-400-001-A	Installation of the Aft Cargo-Compartment Partition at FR47
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Location and Installation of the Sensing Element
Permitted Tolerances of the Sensing Elements
Example for the Installation of a Sensing Element

3. Job Set-up
Subtask 36-22-18-860-058-A

A. Aircraft Maintenance Configuration
(1) Put the WARNING NOTICE(S) in position:

In the cockpit, on the engine control-panel 115VU, to tell persons not to start the engine(s)
In the cockpit, on the AIR COND overhead-control-panel 30VU, to tell persons not to push the APU BLEED pushbutton switch
On the HP ground connector, to tell persons not to pressurize the pneumatic system.

Subtask 36-22-18-865-061-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-22-18-010-055-A

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position.
(2) Get access to the overheat sensing elements between FR35 and FR36:
(a) Remove access panels 191BB and 191EB.
(3) Get access to the overheat sensing elements between FR36 and FR42 LH:
(a) Remove access panel 191JB.
(4) Get access to the overheat sensing elements between FR34 and FR42 RH:
(a) Remove access panels 192EB, 192FB, 192KB and 196AB.
(5) Get access to the overheat sensing elements between FR42 and FR50:
(a) Remove access panels 147AB, 147EB, 147FB and 197BB.
(6) Get access to the overheat sensing elements between FR46 and FR49 from the aft cargo-compartment:
(a) Open aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(b) Remove the applicable access panels for the overheat sensing elements:
1 Between FR46 and FR47

Remove partition panel 151BW (Ref. AMM TASK 25-55-11-000-001).

2 Between FR47 and FR49

Remove access panel 151CW.

4. Procedure
Subtask 36-22-18-220-051-A

A. Inspection of the Overheat Sensing Elements
(1) Make sure that the clearance between the sensing elements and the duct is 12.7 mm (0.50 in.) minimum, measured along the full length of the sensing element.

Example for the Installation of a Sensing Element

(2) Do an inspection of the elements to make sure that they are installed out of the insulation.
(3) Make sure that the clearance between the elements and the duct insulation is the same as at the mounting brackets.
(4) Make sure that the sensing elements are installed with the permitted tolerance.

Permitted Tolerances of the Sensing Elements

(5) Make sure that each clamp has a silicon rubber grommet.
(6) Make sure that each mounting bracket, installed directly on the duct, has a spacer.
(7) For the overheat sensing-elements 33HF/60HF between FR39 and FR40:

Make sure that the spacer is made of Teflon.
If it is made of aluminum, replace it with a Teflon spacer.

(8) Make sure that the elements are installed correctly.

Example for the Installation of a Sensing Element

(9) Make sure that each mounting bracket and clamp is in the correct condition and has no corrosion.
(10) Make sure that the bonding straps are correctly installed (Ref. AMM TASK 20-28-00-912-802).
(11) Make sure that the lockwires are correctly installed on the connections of the sensing elements.
(12) Make sure that the duct insulation is in the correct position and correctly installed.
(13) Make sure that the sensing elements have no cracks, nicks, sharp edges, chafing or corrosion.

5. Close-up
Subtask 36-22-18-410-054-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels as applicable:
(a) For the overheat sensing elements between FR35 and FR36:

Install access panels 191BB and 191EB.

(b) For the overheat sensing elements between FR36 and FR42 LH:

Install access panel 191JB.

Install access panels 192EB, 192FB, 192KB and 196AB.

(d) For the overheat sensing elements between FR42 and FR50:

Install access panels 147AB, 147EB, 147FB and 197BB.

(3) For the overheat sensing elements between FR46 and FR49:
(a) Install the partition panel:
1 Between FR46 and FR47:

Install partition panel 151BW (Ref. AMM TASK 25-55-11-400-001).

2 Between FR47 and FR49:

Install access panel 151CW.

(b) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).

Subtask 36-22-18-865-062-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-22-18-860-059-A

C. Aircraft Maintenance Configuration
(1) Put the aircraft back to its initial configuration.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:17:33 UTC