Detailed Inspection of the Fuselage Overheat Sensing Elements

TASK 36-22-18-200-001-A
Detailed Inspection of the Fuselage Overheat Sensing Elements

FIN: 30HF ** ON A/C NOT FOR ALL
FIN: 31HF ** ON A/C NOT FOR ALL
FIN: 32HF ** ON A/C NOT FOR ALL
FIN: 33HF ** ON A/C NOT FOR ALL
FIN: 34HF ** ON A/C NOT FOR ALL
FIN: 35HF ** ON A/C NOT FOR ALL
FIN: 36HF ** ON A/C NOT FOR ALL
FIN: 47HF ** ON A/C NOT FOR ALL
FIN: 57HF ** ON A/C NOT FOR ALL
FIN: 58HF ** ON A/C NOT FOR ALL
FIN: 59HF ** ON A/C NOT FOR ALL
FIN: 60HF ** ON A/C NOT FOR ALL
FIN: 61HF ** ON A/C NOT FOR ALL
FIN: 62HF ** ON A/C NOT FOR ALL
FIN: 63HF ** ON A/C NOT FOR ALL
FIN: 73HF ** ON A/C NOT FOR ALL
FIN: 74HF ** ON A/C NOT FOR ALL
FIN: 75HF ** ON A/C NOT FOR ALL
FIN: 78HF ** ON A/C NOT FOR ALL
FIN: 79HF ** ON A/C NOT FOR ALL

1. Reason for the Job
Detailed inspection of the 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	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, 191EB, 191JB, 192EB, 192FB, 192KB, 196AB, 197BB
151RW, 191BB
151CW
191PB
151SW

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
Location and Installation of the Sensing Elements
Permitted Tolerances of the Sensing Elements
Example for the Installation of a Sensing Element

3. Job Set-up
Subtask 36-22-18-865-053-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-22-18-860-052-A ** ON A/C NOT FOR ALL

B. 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.

(2) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position.

Subtask 36-22-18-010-051-B ** ON A/C NOT FOR ALL

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

between the FR46 and FR47
remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001)
between the FR47 and FR49
remove the access panel 151CW.

Subtask 36-22-18-010-051-C ** ON A/C NOT FOR ALL

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

between the FR46 and FR47
remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001)
between the FR47 and FR47.4
remove the access panel 151RW
between the FR47.4 and FR49
remove the access panel 151CW.

Subtask 36-22-18-010-051-D ** ON A/C NOT FOR ALL

C. Get Access
(1) Get access to the overheat sensing elements between FR35 and FR36:
(a) Remove the access panels 191PB and 191EB.
(2) Get access to the overheat sensing elements between FR36 and FR42 LH:
(a) Remove the access panel 191JB.
(3) Get access to the overheat sensing elements between FR34 and FR42 RH:
(a) Remove the access panels 192EB, 192FB, 192KB and 196AB.
(4) Get access to the overheat sensing elements between FR42 and FR50:
(a) Remove the access panels 147AB, 147EB, 147FB and 197BB.
(5) Get access to the overheat sensing elements between FR46 and FR53 from the AFT cargo compartment.
(a) Open the AFT cargo compartment door (Ref. AMM TASK 52-30-00-860-001).
(b) Remove the applicable access panels for the overheat sensing elements:

between the FR46 and FR53
remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001) and remove the access panel 151SW.

4. Procedure
Subtask 36-22-18-210-051-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 approximately 12.7 mm (0.5000 in.) minimum, measured over the full length of the sensing element.

Example for the Installation of a Sensing Element ** ON A/C NOT FOR ALL

(2) Do an inspection of the elements to make sure that they are installed outside 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 to the permitted tolerance.

Permitted Tolerances of the Sensing Elements ** ON A/C NOT FOR ALL

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

Make sure that the material of the spacer is teflon. If it is an aluminum spacer, install a teflon spacer.

(8) Make sure that the element at FR80 is installed correctly.

Example for the Installation of a Sensing Element ** ON A/C NOT FOR ALL

(9) Make sure that each mounting and clamp is not damaged 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 connection of the sensing elements.
(12) Make sure that the duct insulation is not damaged and correctly installed.

5. Close-up
Subtask 36-22-18-410-051-B ** 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 access panels as necessary:
(a) For the overheat sensing elements between FR35 and FR36:

Install the access panels 191PB and 191EB.

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

Install the access panel 191JB.

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

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

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

(3) For the overheat sensing elements between the FR46 and FR47:
(a) Install the partition panel 151BW (Ref. AMM TASK 25-55-11-400-001).
(4) For the overheat sensing elements between the FR47 and FR49:

Install the access panel 151CW.

Subtask 36-22-18-410-051-C ** 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 access panels as necessary:
(a) For the overheat sensing elements between FR35 and FR36:

Install the access panels 191BB and 191EB.

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

Install the access panel 191JB.

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

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

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

(3) For the overheat sensing elements between the FR46 and FR47:

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

(4) For the overheat sensing elements between the FR47 and 47.4:

Install the access panel 151RW.

(5) For the overheat sensing elements between the FR47.4 and FR49:

Install the access panel 151CW.

Subtask 36-22-18-410-051-D ** 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 access panels as necessary:
(a) For the overheat sensing elements between FR35 and FR36:

Install the access panels 191PB and 191EB.

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

Install the access panel 191JB.

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

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

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

(3) For the overheat sensing elements between the FR46 and FR53:

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

Subtask 36-22-18-865-054-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	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-22-18-942-053-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:17:30 UTC