Inspection of the Engine Exhaust Cone Skin [IAE]

TASK 78-11-12-200-011-B
Inspection of the Engine Exhaust Cone Skin

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task gives the procedure for V2500-A5 (Perforated Skin) inspection of the engine tail cone skin.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
NSRM 544000
Tail Cone Acoustic Perforated Skin Examination

3. Job Set-up
Subtask 78-11-12-941-059-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-11-12-010-059-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) in to position.

Subtask 78-11-12-040-054-A ** ON A/C NOT FOR ALL

C. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

4. Procedure
Subtask 78-11-12-210-057-A ** ON A/C NOT FOR ALL

A. Examine the Inconel Exhaust Cone (CN9)

Pre SB 70-0922

Tail Cone Acoustic Perforated Skin Examination ** ON A/C NOT FOR ALL

(1) Examine the outer perforated skin.
(a) Dent, gouge, nick, scratch and crack.
1 Refer to NSRM 544000, Common Nozzle Assembly (CNA) and exhaust cone allowable damage, paragraph 3.B., table 101.

Subtask 78-11-12-210-059-A ** ON A/C NOT FOR ALL

B. Examine the Inconel Exhaust Cone (CN9)

Post SB 70-0922

Tail Cone Acoustic Perforated Skin Examination ** ON A/C NOT FOR ALL

(1) Examine the outer perforated skin.
(a) Dent, gouge, nick, scratch and crack.
1 Refer to NSRM 544000, Common Nozzle Assembly (CNA) and exhaust cone allowable damage, paragraph 3.B., table 101.

5. Close-up
Subtask 78-11-12-440-053-A ** ON A/C NOT FOR ALL

A. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 78-11-12-410-057-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 03:27:09 UTC