Operational Check of Channel 1 (2) of the Brake Temperature Monitoring Unit

TASK 32-47-00-710-002-A
Operational Check of Channel 1 (2) of the Brake Temperature Monitoring Unit

FIN: 2GW
FIN: 3GW

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	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	THERMOCOUPLE SIMULATOR
No specific	1	VOLTMETER - DC
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
Brake Temperature Monitoring Unit - Check of Channels

3. Job Set-up
Subtask 32-47-00-941-053-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On the panel 400VU:

make sure that the landing-gear control-lever 6GA is in the DOWN position
put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

Subtask 32-47-00-875-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37

4. Procedure
Subtask 32-47-00-700-050-A

A. Check of channel 1(2) of the related BTMU:
(1) Disconnect the electrical connectors (P1) & (P2) from the brake temperature sensors (1) and (2).
(2) Disconnect the electrical connector (P3) from the related brake temperature monitoring unit.
(a) Energize the BTMU with 28VDC plus or minus 0.1v:
+28VDC at pin J3-A
Ground at pin J3-B
(3) Connect the THERMOCOUPLE SIMULATOR to connector P1:
+Vin at pin P1-C (chromel)
-Vin at pin P1-A (alumel)
(4) Connect the VOLTMETER - DC to connector J3:
+Vout at pin J3-C
-Vout at pin J3-B
(5) on the thermocouple simulator, set the temperatures given in the table below and do a check for the related output voltages:

Temp. °C	Temp. °F	Tolerances °C	Tolerances °F	V out	Tolerances
0	32	+/- 25	+/- 45	1.00 V	+/- 0.2 V
100	212	+/- 17.5	+/- 31.5	1.80 V	+/- 0.14 V
200	392	+/- 10	+/- 18	2.60 V	+/- 0.08 V
250	482	+/- 10	+/- 18	3.00 V	+/- 0.08 V
300	572	+/- 10	+/- 18	3.40 V	+/- 0.08 V
500	932	+/- 25	+/- 45	5.00 V	+/- 0.2 V
600	1112	+/- 31.25	+/- 56.25	5.80 V	+/- 0.25 V
800	1472	+/- 43.75	+/- 78.75	7.40 V	+/- 0.35 V
900	1652	+/- 50	+/- 90	8.20 V	+/- 0.4 V
1000	1832	+/- 50	+/- 90	8.60 V to 9.40 V	8.60 V to 9.40 V

(6) Set a temperature of:
-20 deg.C (-4.00 deg.F) , for type 1001 without amendment A.
-40 deg.C (-40.00 deg.F), for type 1001 with amendment A or type 1002.
(7) Make sure that the output voltage stays at the lower limit (1V plus or minus 0.2V).
(8) Set a temperature of:
1250 deg.C (2282.00 deg.F), for type 1001 without amendment A.
1200 deg.C (2192.00 deg.F), for type 1001 with amendment A or type 1002
(9) Make sure that the output voltage stays at the upper limit :

Between 8.62V and 9.62V, for type 1001 without amendment A.
Between 8.60V and 9.60V, for type 1001 with amendment A or type 1002

(10) Disconnect the THERMOCOUPLE SIMULATOR and make sure that the output voltage becomes more than 12V.
(11) Connect the THERMOCOUPLE SIMULATOR to connector P2:
+Vin at pin P2-C (chromel)
-Vin at pin P2-A (alumel)
(12) Connect the VOLTMETER - DC to connector J3:
+Vout at pin J3-D
-Vout at pin J3-B
(13) Do the same tests on channel 2 (1).

Subtask 32-47-00-875-051-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
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37

5. Close-up
Subtask 32-47-00-942-053-A

A. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(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 00:50:23 UTC