Removal of the Blocker Door Stow-switch [CFMB]

TASK 78-31-18-000-001-A
Removal of the Blocker Door Stow-switch

FIN: 4104KS1 ** ON A/C NOT FOR ALL
FIN: 4104KS2 ** ON A/C NOT FOR ALL
FIN: 4104KS3 ** ON A/C NOT FOR ALL
FIN: 4104KS4 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)
HIX3005	1	SAFETY SLEEVE - PIVOTING DOOR ACTUATOR

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2011)	stoddard solvent
(Material No.CP2559)	ardrox 552
(Material No.CP2560)	turco ind 79
(Material No.CP2566)	mag-chem teksol
(Material No.CP2584)	degreasol 99 R
(Material No.CP2656)	mag-chem skysol

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-32-41-480-001-A	Installation of the Safety Sleeve on Blocker Door Actuator
TASK 78-32-41-860-001-A	Manual Deployment of the Blocker Door
Blocker Door Stow-switch

3. Job Set-up
Subtask 78-31-18-941-050-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 78-31-18-010-050-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) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-31-18-040-050-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 78-31-18-860-050-A ** ON A/C NOT FOR ALL

D. Deploy the blocker door manually (Ref. AMM TASK 78-32-41-860-001).

Subtask 78-31-18-480-050-A ** ON A/C NOT FOR ALL

E. Install the HIX3005 SAFETY SLEEVE - PIVOTING DOOR ACTUATOR on blocker door actuator (Ref. AMM TASK 78-32-41-480-001).

4. Procedure
Subtask 78-31-18-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the blocker door stow-switch.
(1) Loosen the coupling nut of the stow-switch connector with the PLIERS - NOSE, SOFT, LONG
(2) Disconnect the electrical harness from the stow-switch connector.
(3) Remove the three bolts and the nuts which attach the blocker door stow-switch.
(4) Remove the blocker door stow-switch from the aft side of the forward frame.

Subtask 78-31-18-110-050-A ** ON A/C NOT FOR ALL

B. Remove sealant and wipe the zone.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove sealant from the stow-switch and the forward frame with acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .
(2) Wipe dry zone with a clean cloth.

[Rev.10 from 2021] 2026.04.01 13:11:37 UTC