Installation of the Burner Selection Valve (BSV) for SAC Engines [CFMB]

TASK 73-11-70-400-002-A
Installation of the Burner Selection Valve (BSV) for SAC Engines

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This TASK is applicable for SAC Engines.
This task is only applicable for engines that have the burner staging valve (BSV) system installed (CFM56-5B SB 73-0112 and CFM56-5B SB 73-0114). Service Bulletins deleted the BSV system. 73-0112. Service Bulletin CFM56-5B SB 73-0112 deleted the BSV system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-21-00-918-002-A	Seals (Preformed Packings and O-rings) and Gaskets
TASK 71-00-00-710-006-B	Minimum Idle Check
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 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Burner Staging Valve (BSV)

3. Job Set-up
Subtask 73-11-70-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 73-11-70-010-058-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 73-11-70-040-055-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 73-11-70-420-053-A ** ON A/C NOT FOR ALL

A. Install the burner staging valve as follows:
(1) Remove the protective covers from the BSV (70) and the fuel supply manifold.
(2) Do an inspection of the gasket (20) (Ref. AMM TASK 70-21-00-918-002).
(3) Install the gasket (20) between the BSV (70) and the fuel supply manifold.
(4) Install the BSV (70) on the fuel supply manifold.
(5) Lubricate the bolts (10), (40) with graphite grease (Material No.CP2101) .
(6) Install the bolt (10) and bolt (40) in the aft end of BSV.
(7) Install nut (30) to bolt (10).
(8) Install nut (80) to bolt (40).
(9) Install bolt (10) and bolt (40) into the fuel support bracket.
(10) TORQUE the nuts (30), (80) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(11) TORQUE bolts (10), (40) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(12) Remove the protective caps from the electrical connectors.
(13) Connect the electrical connectors, Channel A (50) and Channel B (60), to the BSV (70). Tighten the connectors by hand plus one eight of a turn.

NOTE: If necessary, use PLIERS - JAWED, SOFT.

(14) Perform a minimum idle leak check (Ref. AMM TASK 71-00-00-710-006) and checks on CFDS if no fault is present concerning the BSV.

5. Close-up
Subtask 73-11-70-410-052-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 doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).

Subtask 73-11-70-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 73-11-70-410-053-A ** ON A/C NOT FOR ALL

C. 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 WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:58:16 UTC