Detailed Inspection of Additional Center Tank (ACT), External Surface

TASK 28-28-00-200-004-A
Detailed Inspection of Additional Center Tank (ACT), External Surface

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

1. Reason for the Job
Refer to the MPD TASK: 282801-01
DETAILED INSPECTION OF ADDITIONAL CENTER TANK (ACT), EXTERNAL SURFACE
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-11-27-000-001-A	Removal of the Additional Center Tank (ACT)
TASK 28-11-27-000-002-A	Removal of Additional Center Tank No.1 (ACT AFT1)
TASK 28-11-27-000-003-A	Removal of the Additional Center Tank No.2 (ACT AFT2)
TASK 28-11-27-400-001-A	Installation of the Additional Center Tank (ACT)
TASK 28-11-27-400-002-A	Installation of Additional Center Tank No.1 (ACT AFT1)
TASK 28-11-27-400-003-A	Installation of the Additional Center Tank No.2 (ACT AFT2)
CMM 281135
CMM 281139

3. Job Set-up
Subtask 28-28-00-860-070-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Remove the Additional Center Tank (ACT) (Ref. AMM TASK 28-11-27-000-001).
(3) Make sure that all the surfaces of the ACT can be visually inspected.

Subtask 28-28-00-860-070-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Remove the ACT(s) from the aft cargo-compartment (Ref. AMM TASK 28-11-27-000-001).

NOTE: If you must do an inspection on the forward ACT (ACT1), then remove both ACT(s) from the aft cargo-compartment.

Subtask 28-28-00-860-280-E ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Remove the applicable ACT(s) from the aft cargo compartment:
(a) Remove ACT AFT2 (Ref. AMM TASK 28-11-27-000-003)
(b) Remove ACT AFT1 (Ref. AMM TASK 28-11-27-000-002).

4. Procedure
Subtask 28-28-00-210-053-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection of ACT

NOTE: The applicable CMM task for the examination of the ACT Structure also obeys this inspection task.

(1) Examine the external rib structure of the ACT for cracks, corrosion and other damage.
(2) Examine the fasteners and attachment parts, to make sure they are not loose or damaged.
(3) Examine all the ports, openings and rivets for signs of leakage.

NOTE: Cracks or other damages are not permitted.

(4) Limits for found scratches and dents on the ACT structure are given in the applicable CMM 281135 and CMM 281139.

Subtask 28-28-00-210-060-A ** ON A/C NOT FOR ALL

B. Detailed Visual Inspection of the ACT(s)

NOTE: The subsequent procedure is the same for all the ACT(s). Thus, only one ACT is given.

(1) Examine the external rib structure of the ACT for cracks, corrosion and other damage.

NOTE: Cracks or other damages are not permitted.

(2) Examine the fasteners and the attached parts, to make sure that they are not loose or damaged.
(3) Examine all the ports, openings and rivets for signs of leakage.
(4) Examine the vent tube and the fuel tube of the ACT for scratches and dents:

NOTE: The maximum permitted depth of the dents on the ACT structure is 2.0 MM (0.0787 IN.).

(a) Scratches on the vent tube and the fuel tube of the ACT are not permitted, if there are scratches:
1 Remove the scratches with the depth of 0.2 MM (0.0079 IN.) and the maximum length of 50 MM (1.9685 IN.) of the nominal material thickness.

5. Close-up
Subtask 28-28-00-410-054-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the ACT(s) in the aft cargo-compartment (Ref. AMM TASK 28-11-27-400-001).

Subtask 28-28-00-410-097-E ** ON A/C NOT FOR ALL

B. Close Access
(1) Install the applicable ACT(s) in the aft cargo compartment:
(a) Install ACT AFT1 (Ref. AMM TASK 28-11-27-400-002)
(b) Install ACT AFT2 (Ref. AMM TASK 28-11-27-400-003).

[Rev.10 from 2021] 2026.04.02 06:17:55 UTC