Repair of the Fan Cowl Latch Baulk Bracket Assembly [PW11]

TASK 71-13-10-300-801-A
Repair of the Fan Cowl Latch Baulk Bracket Assembly

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

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

ZONE: 400

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

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	cloth
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU3-0001)	sealant
(Material No.PU3-0001A)	sealing compound
(Material No.PU3-0001B)	sealing compound
(Material No.PU3-0004)	sealant
(Material No.PU3-0004A)	sealant
(Material No.PU3-0005)	PR-2001 rapid cure fuel tank sealant
(Material No.PU3-0005A)	sealant
(Material No.PU3-0005B)	sealant
(Material No.PU3-0008)	sealant

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
TASK 51-75-12-300-003-A	Repair of Minor Paint Damage (Topcoat Only)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
Fan Cowl Baulk Bracket Assembly

3. Job Set-up
Subtask 71-13-10-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 71-13-10-300-050-A ** ON A/C NOT FOR ALL

A. Repair of the Fan Cowl Latch Baulk Bracket Assembly
(1) For CONFIGURATION 1:
(a) Remove the damaged baulk bracket assembly (2) as follows:
1 Remove the four pins (3) and the four nuts (1) that attach the baulk bracket assembly (2) to the fan cowl door and the latch housing.
2 Remove the damaged baulk bracket assembly (2).
(2) For CONFIGURATION 2:
(a) Remove the damaged baulk bracket assembly (2) as follows:
1 Remove the four pins (6), four washers (5) and four nuts (4) that attach the baulk bracket assembly (2) to the fan cowl door and the latch housing.
2 Remove the damaged baulk bracket assembly (2).
(3) For CONFIGURATION 3:
(a) Remove the damaged baulk bracket assembly (7) as follows:
1 Remove the two pins (6), two washers (5) and two nuts (4) that attach the baulk bracket assembly (7) to the fan cowl door and the latch housing.
2 Remove the damaged baulk bracket assembly (7).
(4) For CONFIGURATION 1:
(a) Install the new baulk bracket assembly (2) as follows:
1 Attach the new baulk bracket assembly (2) to the fan cowl and the latch housing. Use the four pins (3) and the four nuts (1). Wet install the pins (3) with the sealant (Material No.PU3-0004) or the alternate sealant (Material No.PU3-0004A) .
2 TORQUE the nuts (1) to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )

.
3 Make sure that the heads of the pins (3) are less than 0.0040 in. (0.1 mm) above the surface of the fan cowl. If the head of a pin is above 0.0040 in. (0.1 mm), remove the baulk bracket assembly (2) and do step 4.A.(4)(a)1_ thru step 4.A.(4)(a)3_ again.
4 Make sure that the heads of the pins (3) are less than 0.0098 in. (0.25 mm) below the surface of the fan cowl. If the head of a pin is below 0.0098 in. (0.25 mm), fill the distance with the PR-2001 rapid cure fuel tank sealant (Material No.PU3-0005) or the sealant (Material No.PU3-0008) .

NOTE: You can use the sealant (Material No.PU3-0005A) or the sealant (Material No.PU3-0005B) as an alternative to the PR-2001 rapid cure fuel tank sealant (Material No.PU3-0005) .
You can use the sealant (Material No.PU3-0001) , sealing compound (Material No.PU3-0001A) or sealing compound (Material No.PU3-0001B) as an alternative to the sealant (Material No.PU3-0008) .

(5) For CONFIGURATION 2:
(a) Install the new baulk bracket assembly (2) as follows:
1 Attach the new baulk bracket assembly (2) to the fan cowl and the latch housing. Use the four pins (6), four washers (5) and four nuts (4). Wet install the pins (6) with the sealant (Material No.PU3-0004) or the alternate sealant (Material No.PU3-0004A) .
2 TORQUE the nuts (4) to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )

.
3 Make sure that the heads of the pins (6) are less than 0.0040 in. (0.1 mm) above the surface of the fan cowl. If the head of a pin is above 0.0040 in. (0.1 mm), remove the baulk bracket assembly (2) and do step 4.A.(5)(a)1_ thru step 4.A.(5)(a)3_ again.
4 Make sure that the heads of the pins (6) are less than 0.0098 in. (0.25 mm) below the surface of the fan cowl. If the head of a pin is below 0.0098 in. (0.25 mm), fill the distance with the PR-2001 rapid cure fuel tank sealant (Material No.PU3-0005) or the sealant (Material No.PU3-0008) .

(6) For CONFIGURATION 3:
(a) Install the new baulk bracket assembly (7) as follows:
1 Clean the faying surfaces of the new baulk bracket assembly (7) and the latch beam with the PU2-0001alcohol, isopropyl on the clean cloth (Material No.PU1-0001) .
2 Clean the faying surfaces with the clean dry cloth (Material No.PU1-0001) before the PU2-0001alcohol, isopropyl dries.
3 Apply a layer approximately 3 - 6 mils (0.076 - 0.152 mm) thick of the sealant (Material No.PU3-0004) or the alternate sealant (Material No.PU3-0004A) to the faying surface of the new baulk bracket assembly (7).

NOTE: If necessary, apply a small bead of the sealant near the edge of the new baulk bracket assembly (7). This will help to make sure that some of the sealant will squeeze-out from below the baulk bracket assembly (7).

4 Attach the new baulk bracket assembly (7) to the fan cowl and the latch housing. Use the two pins (6), two washers (5) and two nuts (4). Wet install the pins (6) with the sealant (Material No.PU3-0004) or the alternate sealant (Material No.PU3-0004A) .
5 TORQUE the nuts (4) to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )

.
6 Make sure that the heads of the pins (6) are less than 0.0040 in. (0.1 mm) above the surface of the fan cowl. If the head of a pin is above 0.0040 in. (0.1 mm), remove the baulk bracket assembly (7) and do step 4.A.(6)(a)1_ thru step 4.A.(6)(a)6_ again.
7 Make sure that the heads of the pins (6) are less than 0.0098 in. (0.25 mm) below the surface of the fan cowl. If the head of a pin is below 0.0098 in. (0.25 mm), fill the distance with the PR-2001 rapid cure fuel tank sealant (Material No.PU3-0005) or the sealant (Material No.PU3-0008) .

8 Make sure that the sealant (Material No.PU3-0004) or the alternate sealant (Material No.PU3-0004A) squeezed-out from below all of the edges of the new baulk bracket assembly (7).
a Fair the sealant along the edges of the new baulk bracket assembly (7) to approximately 0.120 in. (3.05 mm) height.
b Clean unwanted sealant from the latch beam with the PU2-0001alcohol, isopropyl on the cloth (Material No.PU1-0001) .
c Do not get the PU2-0001alcohol, isopropyl in the sealant below the baulk bracket assembly (7).
(7) Repair the paint damage at the heads of the pins (3) or (6) on the surface of the fan cowl (Ref. AMM TASK 51-75-12-300-003).

5. Close-up
Subtask 71-13-10-942-051-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) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:28 UTC