Installation of the Avionics Ventilation Skin Temperature Sensor

TASK 21-26-13-400-001-A
Installation of the Avionics Ventilation Skin Temperature Sensor

ZONE: 126
FIN: 28HQ

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 2M (6 FT) - ADJUSTABLE
No specific	Torque wrench: range to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
126	LATERAL AVIONIC COMPARTMENT
822

D. Referenced Information

REFERENCE	DESIGNATION
TASK 21-26-00-710-001-A	Operational Check of the Avionics Equipment Ventilation-System via MCDU
TASK 21-26-00-710-001-A-01	Operational Check of the Avionics Equipment Ventilation (without the CFDS)
TASK 21-26-13-710-001-A	Operational Test of the Skin Temperature Sensor (without the CFDS)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
Skin Temperature Sensor

3. Job Set-up
Subtask 21-26-13-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 21-26-13-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17

Subtask 21-26-13-010-052-A

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the access door 822.
(2) Make sure that the access door 822 is open.

4. Procedure
Subtask 21-26-13-420-051-C

A. Installation of the Avionics Ventilation Skin Temperature Sensor
(1) Install the sensor (6) on the support (1).
(a) TORQUE the sensor (6) to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in )

NOTE: Make sure that there is a good contact between the sensor (6) and the support (1).

(2) Safety the sensor (6)

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.

(a) Safety the sensor (6) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(3) Install the blanket (7) in correct position on the support (1).
(4) Put the cover (2) in correct position on the support (1).
(5) Install the six washers (3) and screws (4).
(a) Tighten the six screws (4).
(6) Remove the CAP-BLANKING from each electrical connector and receptacle.
(7) Make sure that all the electrical connections are clean and in the correct condition.
(8) Connect the electrical connector (5) to the sensor (6).

Subtask 21-26-13-865-052-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 COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17

Subtask 21-26-13-710-050-A

C. Do an operational test of the ventilation system of the avionics equipment (Ref. AMM TASK 21-26-00-710-001).

NOTE: As an alternative procedure, you can do this operational test without the CFDS (Ref. AMM TASK 21-26-13-710-001).

5. Close-up
Subtask 21-26-13-410-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 822.
(3) Remove the access platform(s).

Subtask 21-26-13-862-051-A

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:11:02 UTC