Detailed Inspection of Interior and Exterior of Plenum Chamber (10HM5 AND 11HM5) for Signs of Delamination

TASK 21-52-00-200-001-A
Detailed Inspection of Interior and Exterior of Plenum Chamber (10HM5 AND 11HM5) for Signs of Delamination

ZONE: 191
ZONE: 192
FIN: 10HM5
FIN: 11HM5

1. Reason for the Job
Refer to the MPD TASK: 215222-01
DETAILED INSPECTION OF INTERIOR AND EXTERIOR OF PLENUM CHAMBER (10HM5 AND 11HM5) FOR SIGNS OF DELAMINATION

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	FLASHLIGHT
No specific	1	MIRROR - INSPECTION
WP632	1	WOODPECKER-MITSUI DETECTOR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191	AIR CONDITIONING COMPT AND FAIRINGS
192	AIR CONDITIONING COMPT AND FAIRINGS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-52-22-000-001-A	Removal of the Fan Plenum Chamber
TASK 21-52-22-400-001-A	Installation of the Fan Plenum Chamber
NTM 511019
Plenum Chamber - Inspection Zones ** ON A/C NOT FOR ALL
Plenum Chamber - Zone 1 ** ON A/C NOT FOR ALL
Plenum Chamber - Zone 2 ** ON A/C NOT FOR ALL
Plenum Chamber - Zone 3 ** ON A/C NOT FOR ALL
Plenum Chamber - Inspection Points

3. Job Set-up
Subtask 21-52-00-861-052-A

A. There is no special job set-up for this task.

Subtask 21-52-00-010-050-A

B. Get Access
(1) Remove the plenum chamber (Ref. AMM TASK 21-52-22-000-001).

4. Procedure
Subtask 21-52-00-220-063-A

A. Detailed Inspection of the Plenum Chamber for Delamination
(1) Use a FLASHLIGHT and a MIRROR - INSPECTION to do a visual inspection of the plenum chamber and make sure that:
(a) There are no loose or damaged parts.
(b) The struts (6) are correctly bonded and attached to the housing (3).
(c) The adhesive bead around the struts (6) is in good condition.
(d) The rivets, where fitted, are not loose or missing.
(e) The outer ring (2), where fitted, is correctly bonded and attached to the housing (3).
(f) The outlet flange (4) is correctly bonded and attached to the housing (3).
(g) The adhesive bead between the outlet flange (4) and the housing (3) is in good condition.
(h) The inlet flange (1) is correctly bonded and attached to the housing (3).
(i) The ejector (10) is correctly bonded to the inner part of the housing (3).
(2) If installed, make sure that:
(a) The lip seal (11) is in good condition.
(b) The access panel (9) and the seal (8) are in good condition.
(c) The locking devices (5) and the locking pins (7) are in good condition.
(d) If any of these parts are broken, incorrectly attached or if they have any other damage, then you must install a new plenum chamber (Ref. AMM TASK 21-52-22-400-001).

CAUTION: WHEN YOU DO THE DETAILED INSPECTION OF THE PACK PLENUM FOR DELAMINATION:

ONLY USE THE SPECIFIED SUPPORT EQUIPMENT AND TOOLS, AND/OR YOUR HANDS.
DO NOT APPLY TOO MUCH PRESSURE ON THE PACK PLENUM.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO THE PACK PLENUM.

(3) Do the visual inspection of the plenum chamber inspection zones:

NOTE: Airbus gives the approved aircraft operation time-limits when the plenum chamber is delaminated.

NOTE: The plenum chamber has three inspection zones:

Zone 1 (the outlet flange and the air-cycle machine flange)
Zone 2 (the heat exchanger flange)
Zone 3 (the housing).

NOTE: Two different types of surfaces can be found:

A surface which is not damaged.
A surface which is possibly damaged (delaminated).

(a) Do the tap test on the possibly damaged surfaces of the plenum chamber to examine them for delamination.

You can use a WP632 WOODPECKER-MITSUI DETECTOR for this procedure.
Refer to NTM 511019.

NOTE: A failed tap test means that the surface is delaminated and that the structure is weaker.

(b) Do a minimum of three tap tests for each zone, with a minimum of two tap tests near mechanical joints.
(c) Tap the surfaces and do the analysis of the sound. Compare the sound and the stiffness between two different surfaces.
(d) For zone 1, the permitted damage is when:

No more than 25.8 cm2 (4.00 in.2) of the surface is delaminated.
No broken fibres are found.
No flange collapses under its own weight.

(e) For zone 2, the permitted damage is when:

No delamination on the corner/bend of the housing is found.
No more than one screw hole, adjacent to the plenum chamber surface, shows delamination.
No more than 25.8 cm2 (4.00 in.2) of the surface is delaminated.
No broken fibres are found.

(f) For zone 3, the permitted damage is when:

No more than three separated areas with less than 25.8 cm2 (4.00 in.2) of the surface are delaminated.

(g) If the damage in one of the zones is more than the specified limit, or you find other damage, such as cracks, loose items or too much fiber separation:

Replace the plenum chamber (Ref. AMM TASK 21-52-22-400-001).

(h) If the plenum chamber is in good condition in all zones, the aircraft can operate without temporary limits.
(i) If the plenum chamber has the permitted damage in only one zone:
1 With the permitted damage in zone 1, the aircraft can operate for a maximum of 1800 flight hours until the next check.
2 With the permitted damage in zone 2, the aircraft can operate for a maximum of 1800 flight hours until the next check.
3 With the permitted damage in zone 3, the aircraft can operate for a maximum of 6000 flight hours until the next check.
(j) If the plenum chamber has the permitted damage in two or more zones:
1 With the permitted damage in zone 1 and zone 3, the aircraft can operate for a maximum of 1200 flight hours until the next check.
2 With the permitted damage in zone 2 and zone 3, the aircraft can operate for a maximum of 1200 flight hours until the next check.
3 With the permitted damage in zone 1 and zone 2 or in all three zones, replace the plenum chamber (Ref. AMM TASK 21-52-22-400-001).

5. Close-up
Subtask 21-52-00-410-050-A

A. Close Access
(1) Install the plenum chamber (Ref. AMM TASK 21-52-22-400-001).
(2) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.02 06:11:24 UTC