Visual Examination of the Rub Blocks [IAE]

TASK 78-11-11-200-012-A
Visual Examination of the Rub Blocks

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 the visual examination of the rub blocks in the common nozzle assembly.
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	MAGNIFYING GLASS POWER 10X
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 71-13-00-010-010-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
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
NSRM 544000
CMM 781111
Rub Blocks

3. Job Set-up
Subtask 78-11-11-941-060-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) in position 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 78-11-11-010-073-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 position.

Subtask 78-11-11-040-062-A ** ON A/C NOT FOR ALL

C. Deactivation of 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) Do the deactivation of the thrust reverser hydraulic-control-unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-11-11-010-074-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

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

A. Examine the Rub Blocks on the Common Nozzle Assembly

Rub Blocks ** ON A/C NOT FOR ALL

(1) Make sure that the rub blocks are clean CMM 781111.
(2) Examine the rub blocks for cracks using MAGNIFYING GLASS POWER 10X.
(a) If there is an evidence of crack, reject the rub block. Replace or remove as necessary, refer to NSRM 544000 repair 10, rub block repair (VRS2140).
(b) If there is no evidence of crack, accept it.
(3) Examine the rub blocks for wear. Measure the remaining thickness of the rub block using MAGNIFYING GLASS POWER 10X.
(a) Refer to NSRM 544000 common nozzle assembly allowable damage. Replace as necessary, refer to NSRM 544000 repair 10 (VRS2140).
(4) Examine for missing rub blocks. Refer to View A-A.
(a) For SNs 8137001 through 10606001 it is acceptable to have twenty rub blocks. If service bulletin V2500-NAC-78-0242 has been performed then thirty-six rub blocks are required. For all other SNs thirty-six rub blocks are required.
(b) It is recommended to perform Service Bulletin V2500-NAC-78-0242 if the number of rub blocks is less than thirty-six.
(c) Check for plugged holes or open holes between existing rub blocks. If found replace rub block, refer to NSRM 544000 repair 10 or Service Bulletin V2500-NAC-78-0242.

5. Close-up
Subtask 78-11-11-410-069-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 78-11-11-440-059-A ** ON A/C NOT FOR ALL

B. Do the activation of the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 78-11-11-410-070-A ** ON A/C NOT FOR ALL

C. 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 03:27:05 UTC