Visual Inspection of the Core Exhaust Nozzle [CFMI]

TASK 78-11-11-210-040-A
Visual Inspection of the Core Exhaust Nozzle

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

1. Reason for the Job
This inspection criteria is only for those portions of the nozzle that can be observed on-wing. Therefore, the limits and remarks do not apply to the attach ring and forward non-accessible areas of the nozzle. Inspection of these areas should be done at the next component removal from the engine.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-11-11-000-040-A	Removal of the Core Nozzle Assembly
TASK 78-11-11-400-040-A	Installation of the Core Nozzle Assembly
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Core Exhaust Nozzle
Inner and Outer Pylon Seals

3. Job Set-up
Subtask 78-11-11-941-058-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 78-11-11-010-068-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Open the thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 78-11-11-210-055-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the core nozzle assembly as follows. Use proper lighting to illuminate the inner and outer skins:

Core Exhaust Nozzle ** ON A/C NOT FOR ALL

Inner and Outer Pylon Seals ** ON A/C NOT FOR ALL

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Inner skin, forward 17 in. (0.43 m) for: NOTE: It is permitted to have polish marks on the inner skin surface.
A.Cracks	No cracks allowed in forward 17 in. (0.43 m) segment.	Replace exhaust nozzle.
2.Inner skin, aft of 17 in. (0.43 m) for: NOTE: It is permitted to have polish marks on the inner skin surface.
A.Cracks	0.25 in. (6.35 mm) max per crack. 2 in. (50.8 mm) max total, all cracks. 2 in. (50.8 mm) minimum separation between any two cracks.	Stop-drill ends with 0.0625 in. (1.6 mm) drill. Inspect for growth at 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest).
3.Outer skin for:
A.Cracks	1 in. (25.4 mm) max per crack. 6 in. (152.4 mm) max total, all cracks. 4 in. (101.6 mm) minimum separation between any two cracks.	Stop-drill ends with 0.125 in. (3.2 mm) drill. Inspect for growth at 750 Flight Hours / 750 Flight Cycles / 4 calendar months (whichever the earliest).
B.Small nicks, gouges, punctures, and cracks	Maximum size 0.12 in. (3 mm).	Clean out damage using a 0.19 in. (4.8 mm) drill.
4.Inner and outer skins for: NOTE: It is permitted to have polish marks on the inner skin surface.
A.Dents	Maximum depth 0.25 in. (6.3 mm). Minimum radius 0.25 in. (6.3 mm). Maximum diameter 2.5 in. (63.5 mm).	OK for flight. Reform to smooth contour at next shop visit.
B.Missing or damaged rivets at stiffeners and angles	Maximum of 5 percent missing or damaged. There must be at least one good rivet between any two that are missing or damaged.	OK for flight. Replace rivets at next shop visit.
5.Forward bulkhead for:
A.Cracks	Not serviceable.	Replace exhaust nozzle.
6.Inner and outer pylon seals for:
A.Wear	Outer seal may be fully worn or not there.	Outer seal wear is permitted for flight. Replace seal at next shop visit.
	Inner seal may not be worn.	Replace exhaust nozzle (Ref. AMM TASK 78-11-11-000-040) and (Ref. AMM TASK 78-11-11-400-040).

5. Close-up
Subtask 78-11-11-410-064-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:56:06 UTC