Detailed Visual Inspection of the Deploy Switches and Triggers [CFMB]

TASK 78-31-17-210-001-A
Detailed Visual Inspection of the Deploy Switches and Triggers

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

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	FLASHLIGHT
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 44 and 35 lbf.in (0.50 and 0.40 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2245)	finish paint EA4 blue 5991

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
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 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-31-17-000-001-A	Removal of the Blocker Door Deploy-Switch
TASK 78-31-17-000-002-A	Removal of the Beam Electrical Harness
TASK 78-31-17-000-003-A	Removal of the Blocker Doors Actuation-Levers
TASK 78-31-17-400-001-A	Installation of the Blocker Door Deploy-Switch
TASK 78-31-17-400-002-A	Installation of the Beam Electrical Harness
TASK 78-31-17-400-003-A	Installation of the Blocker Doors Actuation-Levers
TASK 78-31-17-710-002-A	Operational Test of the Pivoting Door Deploy Switch
TASK 78-32-41-860-001-A	Manual Deployment of the Blocker Door
TASK 78-32-41-860-002-A	Manual Stowing of the Blocker Door
CMM 783117
CMM 783236
Deploy Switch

3. Job Set-up
Subtask 78-31-17-941-056-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on 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 overhead maintenance panel 50VU:
(a) Make sure that the ON legend of ENG/FADEC GND PWR/1(2) pushbutton switch is OFF.
(b) Put a WARNING NOTICE(S) to tell persons not to energize FADEC 1(2).

Subtask 78-31-17-010-055-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 78-31-17-040-053-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-17-010-056-A ** ON A/C NOT FOR ALL

D. Removal of the Access Door:
(1) Remove the screws which attach the deploy-switch access door.
(2) Remove the deploy-switch access door.

Subtask 78-31-17-010-078-A ** ON A/C NOT FOR ALL

E. Manually Deploy the Blocker Doors (Ref. AMM TASK 78-32-41-860-001).

4. Procedure
Subtask 78-31-17-210-050-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection of the Deploy Switches and Triggers.
(1) Do a visual inspection of the deploy switch, the trigger and related hardware, and of the electrical connector using a FLASHLIGHT as follows:

NOTE: Levers and bushings that are removed due to corrosion, faulty operation or play discrepancies may be sent to the shop for repair, review and possible return to service CMM 783236 and CMM 783117.

(2) No play should exist between the bushing and the lever.

NOTE: Determine if play exists between the switch lever and the bushing. This may affect electrical signal while the pivot door is in the deploy condition and may cause deploy signal failure (Ref. AMM TASK 78-31-17-710-002).

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine the deploy switch for:
A.Damage	No damage permitted	If you find some damage, replace the deploy switch (Ref. AMM TASK 78-31-17-000-001) and (Ref. AMM TASK 78-31-17-400-001).
2.Examine the trigger for:
A.Damage	No damage permitted	If you find some damage, replace the defective part (Ref. AMM TASK 78-31-17-000-001) and (Ref. AMM TASK 78-31-17-400-001).
3.Examine the beam electrical harness, for:
A.Cracks	None permitted	If cracks are found, replace the harness (Ref. AMM TASK 78-31-17-000-002) and (Ref. AMM TASK 78-31-17-400-002).
B.Damage threads	None permitted	If the connector is damaged replace the harness (Ref. AMM TASK 78-31-17-000-002) and (Ref. AMM TASK 78-31-17-400-002).
C.Bent pins	None permitted	If the connector has bent pins replace the harness (Ref. AMM TASK 78-31-17-000-002) and (Ref. AMM TASK 78-31-17-400-002).
D.Tightness	The blue mark of the deploy switch must be covered by the blue mark of the beam electrical harness connector.	If the blue mark of the pressure switch can be seen, tighten the electrical connector with PLIERS - NOSE, SOFT, LONG.
4.Examine the inner levers for:
A.Corrosion	None permitted	If the lever has corrosion, replace the inner lever (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).
5.Examine the outer levers and bushing for:
A.Damaged lever or bushing	No damage permitted	If the lever or bushing has damage, replace the lever or bushing (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).
B.Corrosion	None permitted	If the lever or bushing have corrosion, replace the outer lever or bushing (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).
C.Correct operation	Lever should turn fully and easily	If the lever is not easy to turn, clean the lever and bushing. If the lever is still not easy to turn, replace the lever and bushing (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).
D.Lever and bushing play	No play should exist between the lever and bushing	If there is play between the lever and bushing, replace the lever and bushing (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).
E.Damaged or missing pad	No damage permitted
	No missing pad permitted	If the pad is missing or damaged, replace the outer lever (Ref. AMM TASK 78-31-17-000-003) and (Ref. AMM TASK 78-31-17-400-003).

5. Close-up
Subtask 78-31-17-410-054-A ** ON A/C NOT FOR ALL

A. Close Access

NOTE: You should apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) all nuts and connections when you have checked their torques.

(1) Install the deploy-switch access door to the blocker door with the three screws.
(2) TORQUE the screws to between 44 and 35 lbf.in (0.50 and 0.40 m.daN )

Subtask 78-31-17-410-073-A ** ON A/C NOT FOR ALL

B. Manually Stow the Blocker Doors (Ref. AMM TASK 78-32-41-860-002).

Subtask 78-31-17-440-053-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 78-31-17-410-055-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(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 03:24:12 UTC