FCV 1 (FCU 1) Regulation/Indication Fault

TASK 21-51-00-810-807-A
FCV 1 (FCU 1) Regulation/Indication Fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 215101
AMM 21-51-11-000-001	Removal of the Differential Pressure Sensor
AMM 21-51-11-400-001	Installation of the Differential Pressure Sensor
AMM 21-51-51-000-001	Removal of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 21-51-51-400-001	Installation of the Pack Flow-Control Valve/ Pack Flow-Control Unit
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 21-51-00-860-058-B

A. Bleed Air Supply Source from the Engines
(1) Start the engines, Ref. Para. 3.B, to supply the bleed air.

Subtask 21-51-00-860-059-A ** ON A/C NOT FOR ALL

B. Start the engines AMM 71-00-00-710-003 if necessary.

Subtask 21-51-00-860-060-A

C. Initial Test Set-up with Engines as Bleed Air Source Supply
(1) On the AIR COND panel 30VU:

push the HOT AIR pushbutton switch to the on position (the OFF legend goes off),
turn the COCKPIT, FWD CABIN and the AFT CABIN temperature selectors to the HOT positions and,
make sure that the PACK 1 and the PACK 2 pushbutton switches are in the on position (the OFF legends are off).

(2) On the ECAM BLEED page:

NOTE: If the indication shows less than 24 PSI you must slowly adjust the throttle levers until you get the minimum indication of 24 PSI.

Subtask 21-51-00-860-064-B

D. AIDS ALPHA CALL-UP menu

ACTION	RESULT
1.On one MCDU: press the line key adjacent to the AIDS indication.	On the MCDU: the AIDS menu page shows.
- press the line key adjacent to the CALL-UP PARAM indication.	the AIDS PARAM CALL-UP page shows.
- press the line key adjacent to the PARAM ALPHA CALL-UP indication.	the AIDS ALPHA CALL-UP page shows.
2.On the MCDU keyboard: press the up or down arrow keys (to scroll the page).	On the MCDU: empty box indications show in lines.
- press the P and F keys.	In the lower left corner of the AIDS ALPHA CALL-UP page: - PF shows.
3.On the MCDU: press the line key adjacent to one of the empty box line indications.	On the AIDS ALPHA CALL-UP page: - ALPHA, SOURCE and POS.VALUE columns show. Below the ALPHA column: - the indications <PF and KG/SE show. Below the SOURCE column: - the indications PACK-1 and PACK-2 show. Below the POS.VALUE column: - the indications 1:.XX and 2:.XX show. NOTE: XX indicates the actual pack flow values (KG/SE)

Subtask 21-51-00-710-062-C

E. Test

ACTION	RESULT
1.On the AIR COND panel 30VU: turn the PACK FLOW selector to the NORM position and wait for 120 sec.	On the MCDU at the AIDS ALPHA CALL-UP page: under the POS VALUE column the indication 1: shows between .47 and .63 (KG/SE).

4. Fault Isolation
Subtask 21-51-00-810-075-E ** ON A/C NOT FOR ALL

A. On the MCDU at the AIDS ALPHA CALL-UP page:

if the POS VALUE indication 1: does not agree with the flow indication parameters:
make sure that the torque of the sense line connectors at the flow control valve and related sensor is correct. AMM 21-51-11-400-001 and AMM 21-51-51-400-001.

(1) If the fault continues:

(2) If the fault continues:

(3) If the fault continues:

(4) If the fault continues:

Subtask 21-51-00-810-075-F ** ON A/C NOT FOR ALL

A. On the MCDU at the AIDS ALPHA CALL-UP page:

if the POS VALUE indication 1: does not agree with the flow indication parameters:

(1) If the fault continues:

(2) If the fault continues:

Subtask 21-51-00-710-063-A

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

5. Close-up
Subtask 21-51-00-860-056-C

A. Stop the engines AMM 71-00-00-710-028.

[Rev.8 from Aug 2018] 2026.04.04 04:38:52 UTC