Pack 1 and Pack 2 Flow Indication Fault

TASK 21-51-00-810-827-A
Pack 1 and Pack 2 Flow Indication Fault

1. Possible Causes

PRESS CONT 1 [11HL]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 21-51-00-810-807-A	FCV 1 (FCU 1) Regulation/Indication Fault
TSM TASK 21-51-00-810-813-A	Pack 1 Flow Indication Fault
TSM TASK 21-51-00-810-814-A	Pack 2 Flow Indication Fault
AMM 12-33-21-618-001	Pre-conditioning through the LP Ground Connection
AMM 21-31-34-000-001	Removal of the Cabin Pressure Controller
AMM 21-31-34-400-001	Installation of the Cabin Pressure Controller
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 21-51-00-860-080-A

A. Bleed Air Supply Source from the HP Ground Connection

NOTE: The HP ground supply source must be able to give a pack inlet pressure of 24 PSI minimum. If it can not do this then you must get the bleed air supply from the engines.
The work steps which follow show the conditions necessary before you get the minimum pack-inlet pressure.

(1) Do the pre-conditioning through the HP ground connection AMM 12-33-21-618-001.
(2) 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).

(3) On the ECAM BLEED page:

make sure that the pack 1 inlet pressure indication shows a minimum of 24 PSI.
make sure that the pack 2 inlet pressure indication shows a minimum of 24 PSI.

NOTE: If the indication shows less than 24 PSI you must:

increase the ground pressure supply until the indication shows a minimum of 24 PSI.

Subtask 21-51-00-860-081-A ** ON A/C NOT FOR ALL

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

Subtask 21-51-00-860-082-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:

make sure that the pack 1 inlet pressure indication shows a minimum of 24 PSI.
make sure that the pack 2 inlet pressure indication shows a minimum of 24 PSI.

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 21-51-00-710-089-A

D. Test

ACTION	RESULT
1.On the AIR COND panel 30VU: turn the PACK FLOW selector to the LO position and wait for 120 sec.	On the ECAM BLEED page: the pack 1 flow indication shows between the LO and the 11 o'clock positions. the pack 2 flow indication shows between the LO and the 11 o'clock positions.
2.On the AIR COND panel 30VU: push the PACK 2 P/BSW and wait for 120 sec.	On the AIR COND panel 30VU: the OFF light of the PACK 2 P/BSW comes on.
	On the ECAM BLEED page: the pack 1 flow indication shows between the 1 o'clock and the HI positions.
3.On the AIR COND panel 30VU: push the PACK 2 P/BSW.	On the AIR COND panel 30VU: the OFF light of the PACK 2 P/BSW goes off.
4.On the AIR COND panel 30VU: push the PACK 1 P/BSW and wait for 120 sec.	On the AIR COND panel 30VU: the OFF light of the PACK 1 P/BSW comes on.
	On the ECAM BLEED page: the pack 2 flow indication shows between the 1 o'clock and the HI positions.
5.On the AIR COND panel 30VU: push the PACK 1 P/BSW.	On the AIR COND panel 30VU: the OFF light of the PACK 1 P/BSW goes off.
6.On the AIR COND panel 30VU: turn the PACK FLOW selector to the NORM position and wait for 120 sec.	On the ECAM BLEED page: the pack 1 flow indication shows between the 11 o'clock and the 1 o'clock positions. the pack 2 flow indication shows between the 11 o'clock and the 1 o'clock positions.
7.On the AIR COND panel 30VU: turn the PACK FLOW selector to the HI position and wait for 120 sec.	On the ECAM BLEED page: the pack 1 flow indication shows between the 1 o'clock and the HI positions. the pack 2 flow indication shows between the 1 o'clock and the HI positions.

4. Fault Isolation
Subtask 21-51-00-810-109-A ** ON A/C NOT FOR ALL

A. If the pack 1 and pack 2 flow indicator is stuck in the high position and aircraft is located at high altitude airport.
(1) Do the test of the actual pack flow values (Ref. TSM TASK 21-51-00-810-807).
(2) If the test of the pack flow values is OK and does not agree with the flow indication parameters, no other maintenance action is necessary.

NOTE: This is normal system behaviour when aircraft is located at high altitude airport.

Subtask 21-51-00-810-108-A

B. If the pack 1 and pack 2 flow indicator is stuck in the high or low position:
(1) replace the PRESS CONT 1 [11HL] AMM 21-31-34-000-001 AMM 21-31-34-400-001.
(2) If the fault continues:

do the troubleshooting procedures for single pack flow indication fault (Ref. TSM TASK 21-51-00-810-813) and (Ref. TSM TASK 21-51-00-810-814).

Subtask 21-51-00-710-090-A

C. Do the test as given in the Para. 3.D.

5. Close-up
Subtask 21-51-00-860-083-A ** ON A/C NOT FOR ALL

A. Stop the engines AMM 71-00-00-710-028 or the preconditioning through the HP ground connection AMM 12-33-21-618-001 (as applicable).

[Rev.8 from Aug 2018] 2026.04.04 04:24:49 UTC