Installation of the Bleed Bias Venturi [CFMI]

TASK 75-34-20-400-001-A
Installation of the Bleed Bias Venturi

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 51 and 47 lbf.in (0.58 and 0.53 m.daN )
No specific	Torque wrench: range to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )
No specific	Torque wrench: range to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )
No specific	Torque wrench: range to between 290 and 270 lbf.in (3.28 and 3.05 m.daN )

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 71-00-00-710-006-A	Minimum Idle Check
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 73-29-00-710-040-A	Operational Test of the FADEC on the ground (with Engine Motoring)
TASK 73-29-00-710-040-A-01	FADEC Ground Test Without the CFDS
TASK 73-29-00-710-040-A-02	Operational Test of the FADEC on the Ground (with Engine non Motoring)
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
BLEED BIAS Venturi

3. Job Set-up
Subtask 75-34-20-860-050-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) 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 1M(3 FT) is in position.

Subtask 75-34-20-010-052-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 75-34-20-040-051-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 75-34-20-420-050-A ** ON A/C NOT FOR ALL

A. Remove the cover from the stage 9 bleed port.
(1) Install the Bleed Bias Venturi (10) and the metal seal ring (40) to the stage 9 bleed port. Make sure the large diameter nipple is at the top of the Bleed Bias Venturi (10).
(2) Install the 4 bolts (50) into Bleed Bias Venturi (10).
(3) TORQUE the 4 bolts (50) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(4) Remove the blanking plugs from the Bleed Bias Venturi inlets and the B-nuts on the total and Static Pressure Tubes (20 and 30).
(5) Install the Static Pressure Tube (20) to the top nipple on the Bleed Bias Venturi (10). Do not torque at this time.
(6) Install the Total Pressure Tube (30) to the bottom nipple on the Bleed Bias Venturi (10). Do not torque at this time.
(7) Install the tube clamp (120) that attaches the Static Pressure Tube (20) to the attachment bracket (130). Use one bolt (100) and one nut (110).
(8) TORQUE the bolt (100) to between 51 and 47 lbf.in (0.58 and 0.53 m.daN )

.
(9) Install the tube clamps (70) that attach the Static Pressure Tube (20) and the Total Pressure Tube (30) to the attachment bracket (130). Use one bolt (60) and one nut (90).
(10) TORQUE the bolt (60) to between 51 and 47 lbf.in (0.58 and 0.53 m.daN )

.
(11) TORQUE the large B-nut on the Static Pressure Tube (20) to between 290 and 270 lbf.in (3.28 and 3.05 m.daN )

.
(12) TORQUE the smaller B-nut on the Total Pressure Tube (30) to between 145 and 135 lbf.in (1.64 and 1.53 m.daN )

Subtask 75-34-20-861-050-A ** ON A/C NOT FOR ALL

B. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 75-34-20-710-050-A ** ON A/C NOT FOR ALL

C. Do this test:
(1) Do a fadec ground test (Ref. AMM TASK 73-29-00-710-040).
(2) Do a minimum idle check and a check for leaks (Ref. AMM TASK 71-00-00-710-006).

Subtask 75-34-20-862-050-A ** ON A/C NOT FOR ALL

D. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 75-34-20-410-050-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

Subtask 75-34-20-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 75-34-20-410-051-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 access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:36:57 UTC