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EFFECTIVITY
GUN 013-099, 103-115; GUN 001-012, 101, 102, 201-999 POST SB 737-
28A1206
28-22-00
Page 14
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-004
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE FUEL FEED - FUNCTIONAL DESCRIPTION - CENTER TANK BOOST PUMP
28-22-00
Page 15
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The boost pumps supply fuel from main tank 1 to the engine
feed manifold.
The boost pumps supply fuel at a minimum pressure of 10 psi at
a flow rate of 20,000 pph (9,071 kgph).
Each of the boost pumps in main tank 1 and main tank 2 are
interchangeable.
Location
The forward boost pump is on the left wing front spar. Access to
the left forward boost pump is through a deployed leading edge
flap. The aft boost pump is on the left wing rear spar. Access to
the aft boost pump is through the left wheel well.
The pressure switch for the forward boost pump is on the front
spar. Access to this pressure switch is through an access panel
on the top of the left wing. The pressure switch for the aft boost
pump is on the rear spar. Access to this pressure switch is
through the left wheel well.
Boost Pump Housing
The housing contains these components:
* Discharge check valve
* Removal check valve
* Vapor discharge check valve.
The discharge check valve is a flapper type valve. The
discharge check valve prevents fuel flow from the engine feed
manifold through the pump.
The removal check valve is a poppet type valve. The removal
check valve closes when you remove the motor. This permits
motor removal without defueling tank 1.
The vapor discharge check valve prevents a reverse flow of
fuel, from the tank, through the pump.
Boost Pump Motor
The motor has the impeller and uses three-phase, 115v ac
power. It is inside the housing.
Pressure Switch
The low pressure switch sends a low boost pump pressure
signal to the LOW PRESSURE light (P5).
ENGINE FUEL FEED - MAIN TANK 1 FORWARD AND AFT BOOST PUMPS
EFFECTIVITY
GUN ALL 28-22-00
Page 16
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-005
ENGINE FUEL FEED - MAIN TANK 1 FORWARD AND AFT BOOST PUMPS
ENGINE FUEL FEED - MAIN TANK 1 FORWARD AND AFT BOOST PUMPS
EFFECTIVITY
GUN ALL 28-22-00
Page 17
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-22-00-005
General
The boost pumps supply fuel from main tank 2 to the engine
feed manifold.
The boost pumps supply fuel at a minimum pressure of 10 psi
and a minium flow rate of 20,000 pph (9,071 kgph).
Each of the boost pumps in main tank 2 and main tank 1 are
interchangeable.
Location
The forward boost pump is on the right wing front spar. Access
to the right boost pump is through a deployed leading edge flap.
The aft boost pump is on the rear spar. Access to the aft boost
pump is through the right wheel well.
The pressure switch for the forward boost pump is on the front
spar. Access to this pressure switch is through an access panel
on the top of the right wing. The pressure switch for the aft boost
pump is on the rear spar. Access to this pressure switch is
through the right wheel well.
Boost Pump Housing
The housing contains these components:
* Discharge check valve
* Removal check valve
* Vapor discharge check valve.
The discharge check valve is a flapper type valve. The
discharge check valve prevents fuel flow from the engine feed
manifold through the pump.
The removal check valve is a poppet type valve. The removal
check valve closes when you remove the motor. This allows
motor removal without defueling main tank 2.
The vapor discharge check valve prevents a reverse flow of
fuel, from the tank, through the pump.
Boost Pump Motor
The motor has the impeller and uses 115v ac power. It is inside
the housing.
Pressure Switch
The low pressure switch sends a low boost pump pressure
signal to the LOW PRESSURE light (P5).
ENGINE FUEL FEED - MAIN TANK NO. 2 FORWARD AND AFT BOOST PUMPS
EFFECTIVITY
GUN ALL 28-22-00
Page 18
D633A101-GUN Jun 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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