General Visual Inspection of Primary Latch Mechanism (Blocker Doors Deployed) [CFMB]

TASK 78-31-00-210-041-B
General Visual Inspection of Primary Latch Mechanism (Blocker Doors Deployed)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

1. Reason for the Job
Refer to the MPD TASK: 783100-C7
GENERAL VISUAL INSPECTION OF PRIMARY LATCH MECHANISM (BLOCKER DOORS DEPLOYED)
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	WARNING NOTICE(S)
HIX3005	1	SAFETY SLEEVE - PIVOTING DOOR ACTUATOR

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 71-13-00-010-040-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 78-31-19-000-001-A	Removal of the Blocker Door Latches
TASK 78-31-19-400-001-A	Installation of the Blocker Door Latches
TASK 78-31-49-400-042-A	Installation of the Upper Supply Pipe of the Left Latch
TASK 78-31-49-400-043-A	Installation of the Lower Supply Pipe of the Left Latch
TASK 78-31-49-400-044-A	Installation of the Lower Supply Pipe of the Right Latch
TASK 78-31-49-400-045-A	Installation of the Upper Supply Pipe of the Right Latch
TASK 78-32-41-000-003-A	Removal of the Latch Fitting and Latch Back Plate
TASK 78-32-41-080-001-A	Removal of the Safety Sleeve from Blocker Door Actuator
TASK 78-32-41-400-003-A	Installation of the Latch Fitting and Latch Back Plate
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
TASK 78-32-41-860-002-A	Manual Stowing of the Blocker Door
Primary Latch Mechanism

3. Job Set-up
Subtask 78-31-00-941-054-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 78-31-00-010-060-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 78-31-00-040-054-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-00-860-072-A ** ON A/C NOT FOR ALL

D. Manually bring the blocker door to deploy position (Ref. AMM TASK 78-32-41-860-001)

Subtask 78-31-00-081-052-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-00-210-053-A ** ON A/C NOT FOR ALL

A. Do a visual inspection of the primary latch mechanism as follows:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Examine each blocker door latch mechanism for:
A.Damage	No damage permitted	If you find some damage, replace the door latch. (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001).
B.Leakage	No leakage permitted	If you find any leakage, examine the supply pipes for the the correct torque (Ref. AMM TASK 78-31-49-400-042), (Ref. AMM TASK 78-31-49-400-043), (Ref. AMM TASK 78-31-49-400-044) and (Ref. AMM TASK 78-31-49-400-045).
		If leakage continues replace the latch (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001).
2.Examine the latch hook for:
A.Damage	No damage permitted	If you find some damage, replace the blocker door latch (Ref. AMM TASK 78-31-19-000-001) and (Ref. AMM TASK 78-31-19-400-001).
3.Examine the latch fitting and roller for:
A.Damage	No damage permitted	If you find some damage, replace the defective part (Ref. AMM TASK 78-32-41-000-003) and (Ref. AMM TASK 78-32-41-400-003).
B.Jamming	The roller must be free to turn	If the roller is not free, remove it (Ref. AMM TASK 78-32-41-000-003) and reinstall it (Ref. AMM TASK 78-32-41-400-003).
C.Lubrication	The roller axis must be lubricated	If the roller axis is dry without lubrication, remove the roller (Ref. AMM TASK 78-32-41-000-003), lubricate the axis and install (Ref. AMM TASK 78-32-41-400-003).
4.Examine the parts that attach the latch fitting and roller, look for:
A.Loose fastener	None permitted	If you find a loose fastener, re-torque the part (Ref. AMM TASK 78-32-41-400-003).
B.Missing Fastener	None permitted	If parts are missing replace the missing part.

5. Close-up
Subtask 78-31-00-410-060-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.

Subtask 78-31-00-481-052-A ** ON A/C NOT FOR ALL

B. Remove the safety sleeve (HIX-3005) from blocker door actuator (Ref. AMM TASK 78-32-41-080-001)

Subtask 78-31-00-860-073-A ** ON A/C NOT FOR ALL

C. Manually bring blocker doors to stow position (Ref. AMM TASK 78-32-41-860-002)

Subtask 78-31-00-440-054-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-00-410-061-A ** ON A/C NOT FOR ALL

E. Close Access
(1) 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
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:24:00 UTC