Mixer Unit R/H (Cabin) Temperature Sensor Fault

TASK 21-63-00-810-816-A
Mixer Unit R/H (Cabin) Temperature Sensor Fault

1. Possible Causes

TEMP SENSOR RH MIXER [25HK]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-63-00-710-004	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216302
ASM 216303
AMM 21-63-16-000-001	Removal of the Mixer Temperature Sensor
AMM 21-63-16-400-001	Installation of the Mixer Temperature Sensor

3. Fault Confirmation
Subtask 21-63-00-710-081-A ** ON A/C NOT FOR ALL

A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.

NOTE: If a fault is detected, the ZC gives a fault code for shop maintenance in addition to the related CFDS message(s). For detailed information see the applicable Page Block 301.

Subtask 21-63-00-710-081-B ** ON A/C NOT FOR ALL

A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.

4. Fault Isolation
Subtask 21-63-00-810-072-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TEMP SENSOR R/H MIXER:

replace the TEMP SENSOR RH MIXER [25HK] (referred to as SENSOR (25HK)) AMM 21-63-16-000-001 and AMM 21-63-16-400-001.

(1) If the fault continues:

do a check and repair the wiring between:
SENSOR (25HK) connector A/E and ZC (8HK) connector AA/10C,
SENSOR (25HK) connector A/F and ZC (8HK) connector AA/10D,
SENSOR (25HK) connector A/C and ZC (8HK) connector AA/10H,
SENSOR (25HK) connector A/D and ZC (8HK) connector AA/10G,
SENSOR (25HK) connector A/A and GND ASM 216303.

Subtask 21-63-00-810-072-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TEMP SENSOR R/H MIXER(25HK):

replace the TEMP SENSOR RH MIXER [25HK] AMM 21-63-16-000-001 and AMM 21-63-16-400-001.

(1) If the fault continues:

do a check and repair the wiring ASM 216302 from:
the SENSOR (25HK) to the ACSC2 (57HH) and,
the SENSOR (25HK) to ground.

Subtask 21-63-00-710-082-A

B. Do the test as given in the Para. 3.A.

5. Close-up
Subtask 21-63-00-860-065-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:25:01 UTC