737 Systems Schematics

SFS

Southeast Flight Support

Boeing 737-300/400/500 Bleed Air System Schematic L RECIRC FAN

R RECIRC FAN

OFF AUTO

1

OFF AUTO 40

60 60

RR

R

LL

20 20

00

OVHT

80 80 80 80 PSI PSI

100 100

TEST

L PACK

WING ANTI ICE

CONDITION: ENGINES OPERATING & SUPPLYING AIR CONDITIONING PACKS 1

R PACK

OFF ISOLATION OFF VALVE AUTO AUTO CLOSE HIGH AUTO HIGH

PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF

OPEN

TRIP

WING ANTI ICE

PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF

RESET OFF ON

737-400 1

BLEED AIR TO ASP TAT PROBE

OFF ON

APU BLEED

2

TO PACK VALVE

TURBOFAN VALVE FROM RIGHT ENGINE

TO TURBOFAN DUCT PRESSURE TRANSMITTER WING TAI VALVE TO WING TIA

ISOLATION VALVE TO HYD EXTERNAL RESERVE AIR CONNECTION TO HYD RESERVE

STARTER STARTER VALVE BLEED AIR DUCT 5th STAGE COWL TAI

ENGINE BLEED AIR VALVE

9th STAGE HIGH STAGE VALVE

S APU BLEED AIR VALVE BLEED TRIP SENSORS

SFS

Southeast Flight Support

Boeing 737-300/400/500 Wing-Body Overheat Ducts & Lights

5

7

4

8

6

3

2 1

L RECIRC FAN

R RECIRC FAN

OFF AUTO

1

OFF AUTO

R RECIRC FAN OFF AUTO 40 LL

20

60

RR

OVHT

80 80 PSI

0

100

TEST

L PACK

OFF ISOLATION VALVE AUTO HIGH

WING-BODY OVERHEAT

WING ANTI ICE

PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF

CLOSE

R PACK

OFF AUTO AUTO HIGH

OPEN

TRIP

WING ANTI ICE

PACK TRIP OFF WING-BODY OVERHEAT BLEED TRIP OFF

WING-BODY OVERHEAT

RESET OFF ON

LEFT LIGHT SENSORS LOCATED:

OFF ON

APU BLEED

1

2

RIGHY LIGHT SENSORS LOCATED:

1. LEFT ENGINE STRUT.

6. RIGHT ENGINE STRUT.

2. LEFT INBOARD WING LEADING EDGE. 3. LEFT-HAND AIR CONDITIONING BAY 4. KEEL BEAM 5. BLEED DUCT FROM APU.

7. RIGHT INBOARD WING LEADING EDGE. 8. RIGHT-HAND AIR CONDITIONING BAY

1

737-400

SFS

Southeast Flight Support

Boeing 737-300/400/500 Air Conditioning Pack Schematic TO MIX MANIFOLD

PASS CABIN

.

AUTO

COOL

WARM

COOL

WARM

MANUAL

MIXING CHAMBER

R PACK OFF AUTO HIGH PACK TRIP OFF WING-BODY OVERHEAT

WATER SEPARATOR

WING ANTI ICE

.

.

.

.

AUTO TEMP CONTROLLER

HOT AIR MIX VALVE

AIR CYCLE MACHINE

. COLD AIR MIX VALVE

BLEED AIR PACK VALVE

RIGHT BLEED AIR

CONDITIONED AIR COLD AIR BLEED AIR HEAT EXCHANGER COOLED AIR

RAM AIR

SFS

Southeast Flight Support

Boeing 737-300/400/500 Air Conditioning Distribution Schematic

CONT CABIN

SUPPLY DUCT

PASS CABIN

PASS CABIN

CO

CO

80

T

T

60 40 TEMP

DUCT OVERHEAT

D

HO

L

AIR MIX VALVE

HO

L

AIR MIX VALVE D

AIR TEMP

DRIVES MIX VALVES FULL COLD

DUCT OVERHEAT

20 100 0

R PACK

TO RIGHT PACK VALVE

OFF AUTO HIGH PACK TRIP OFF WING-BODY OVERHEAT

WING ANTI ICE

.

.

FILTER

.

LEFT SIDEWALL RISER

RECIRC FAN LEFT PACK TRIP OFF

.

. .

.

LEFT DUCT OVERHEAT

TO RIGHT SIDEWALL RISER

RIGHT PACK TRIP OFF RIGHTDUCT OVERHEAT

.

MIXED MANIFOLD

FROM LEFT PACK

FROM RIGHT PACK GROUND PRECONDITIONED AIR SUPPLY CONDITION: IN FLIGHT PACKS ON CONDITIONED AIR

.

.

SFS

Southeast Flight Support

Boeing 737-300/400/500 Air Conditioning Pack Schematic CONT CAB AUTO

FWD CAB AUTO

AFT CAB AUTO

. . . . . . . .. . . . C

0FF

C

W

W 0FF

C

TO MIX MANIFOLD

W 0FF

. .

R ELECTRONIC CONTROLLER L PRIMARY PACK CONTROL R RAM AIR CONTROL L STBY PACK CONTROL

L ELECTRONIC CONTROLLER L PRIMARY PACK CONTROL L RAM AIR CONTROL R STBY PACK CONTROL

PACK TEMP CONT VALVE STBY PACK TEMP CONT VALVE

WATER SEPARATOR

RAM AIR

.

AIR CYCLE MACHINE

R PACK OFF AUTO HIGH

PACK WING-BODY OVERHEAT

TO TRIM AIR SYSTEM

.

WING ANTI ICE

LEFT BLEED AIR

BLEED AIR PACK VALVE RIGHT BLEED AIR

CONDITIONED AIR COLD AIR BLEED AIR HEAT EXCHANGER COOLED AIR

SFS

Southeast Flight Support

Boeing 737-300/400/500 Air Conditioning Distribution Schematic

TRIM AIR OFF ON

ZONE TEMP CONT CAB

ZONE TEMP

ZONE TEMP

FWD CAB

AFT CAB

. .

L ELECTRONIC CONTROLLER AFT CAB ZONE TEMP CONTROL

.

ELECTRIC FANS

R ELECTRONIC CONTROLLER FWD CAB ZONE TEMP CONTROL

BACK-UP FLIGHT DECK ZONE TEMP CONTROL

TRIM AIR MODULATING VALVES

PRIMARY FLIGHT DECK ZONR TEMP CONTROL

MIXED MANIFOLD

L PACK

R PACK GROUND PRECONDITIONED AIR

CONDITION: IN FLIGHT PACKS ON CONDITIONED AIR BLEED AIR

TRIM AIR PRESSURE REGULATOR & SHUTOFF VALVE

SFS

Southeast Flight Support

Boeing 737-300/400/500 Cabin Pressure Control System Schematic

CONDITIONED AIR FROM OVERHEAD AND SIDEWALL OUTLETS

TO STBY

AUTO TRANSFER AUTO FAIL

OFF SCHED DESENT

STANDBY

ADC

MANUAL

STATIC PORTS

CABIN SENSE PORT CAPT

F/O

AIRPLANE ALTIMETERS BARO SET

RECIRC FAN F L T

OFF

737-400 R RECIRC FAN

AUTO

G R D

OFF AUTO

FORWARD OUTFLOW SENSOR

NEGATIVE PRESSURE RELIEF DC AIR/GROUND SAFTY SENSOR

AC MAIN OUTFLOW VALVE

PRESSURE RELIEF AT 8.65 PSI CONDITION: IN FLIGHT NORMAL OPERATION

SFS

Southeast Flight Support

Boeing 737-300/400/500 Anti-Ice Components Schematic

ELEVATOR PITOT PROBES (2 PLACES)

FLIGHT DECK WINDOWS WINDOW HEAT WINDSHIELD WIPERS RAIN REPELENT

. .

. ANGLE AIRFLOW SENSOR (2 PLACES)

TEMPERATURE PROBE PITOT STATIC PROBE (4 PLACES)

ENGINE COWL LIP

LEADING EDGE SLATS

SFS

Southeast Flight Support

Boeing 737-300/400/500 Engine Anti-Ice System Schematic

COWL ANTI-ICE COWL VALVE OPEN

ENGINE COWL ANTI-ICE (TAI)

.

.

COWL ANTI-ICE COWL VALVE OPEN

ENG ANTI-ICE OFF ON

1 5 TH ENGINE BLEED VALVE

COWL ANTI-ICE VALVE

9 TH HIGH STAGE VALVE

BLEED AIR

TO PNEUMATIC SYSTEM

2

SFS

Southeast Flight Support

Boeing 737-300/400/500 Wing Anti-Ice System Schematic

L VALVE OPEN

R VALVE OPEN

WING ANTI-ICE OFF ON

THRUST

BELOW T. O. WARNING ABOVE T. O. WARNING THERMAL SWITCH

GROUND

HIGH TEMP

AIR

LOW TEMP RIGHT MAIN LANDING GEAR

PNEUMATIC MANIFOLD WING ANTI-ICE CONTROL VALVE

LEADING EDGE SLATS

.

.

. .

WING DISTRIBUTION DUCT TELESCOPING DUCT CONDITION: BLEED AIR ON THE GROUND WING ANTI-ICE ON ENGINES AT IDLE THRUST DUCT TEMP LOW

SFS

Southeast Flight Support

Boeing 737-300/400/500 Electrical Power Schematic

GRD POWER AVAILABLE

STANDBY PWR OFF

LOW OIL PRESSURE

STANDBY POWER

HIGH OIL TEMP

BAT

OFF

80 IN 120

IN DRIVE CAN BE RECONNECTED ONLY ON 30 GRD

EXTERNAL AC BUS GEN GEN DRIVE 1

100 50

OFF

BUS SWITCHING

ON

BUS TRANS A U T O

O F F

BUS OFF

BUS OFF GEN OFF BUS

30

80 IN 120

TRANSFER BUS OFF

APU GEN OFF BUS

GEN OFF BUS

10 RISE 20 0

160

150 AC AMPERES

0

AUTO

OFF

OFF 160

40

GEN DRIVE OIL TEMP ºC

115v AC GND SERVICE BUS

0

TRANSFER BUS OFF

40

GND SERVICE º RELAY º

150 AC AMPERES

RISE

10 RISE 20

ºº

50

HIGH OIL PRESSURE

DRIVE TEMP

0

GRD PWR

100

DISCONECT

DISCONECT

GENERATOR DRIVE & STANDBY POWER PANEL

LOW OIL PRESSURE

GEN DRIVE OIL TEMP ºC

ON

ON

GEN 1

.

APU GEN

GEN 2

.

º º

GEN APU

º º

ºº

GENERATOR BUS 2

GENERATOR BUS 1 NORMAL

115v AC GND MAIN BUS 1

º º

º º

.

GEN GEN 2 DRIVE

TR 1

.

NORMAL

ALTERNATE TRANSFER RELAY 2

ALTERNATE TRANSFER RELAY 1 115v AC TRANSFER BUS 1

TR3 DISCONNECT RELAY

º º

.

115v AC TRANSFER BUS 2

115v AC MAIN BUS 2

TR 2

TR 3

.

DC BUS 2

DC BUS 1

AC STANDBY BUS DC STANDBY BUS

.

BATTERY BUS

INW

º º

HOT BATTERY BUS APU START BATT CHGR CONDITION: INFLIGHT BATTERY SWITCH ON STANDBY POWER SWITCH AUTO BUS TRANSFER SWITCH AUTO ENGINE GENERATOR CONNECTED TO RESPECTIVE BUS

.

. . BATTERY

SWITCHED HOT BAT BUS EXTERNAL DC RECEPTACLE

SFS

Southeast Flight Support

Boeing 737-300/400/500 AC Power Schematic

GRD POWER AVAILABLE

GRD PWR

EXTERNAL AC BUS

OFF

ON

GEN GEN DRIVE 1

OFF ON

GROUND SERVICE

GEN APU

.

OFF

OFF

ON

ON

GEN 1

º

APU GEN APU

GEN 2

GENERATOR BUS 2

GENERATOR BUS 1

GND SERVICE º RELAY

115v AC GND SERVICE BUS

GEN GEN 2 DRIVE

NORMAL

115v AC MAIN BUS 1

ALTERNATE TRANSFER RELAY 1

115v AC TRANSFER BUS 1

CONDITION: INFLIGHT BATTERY SWITCH ON STANDBY POWER SWITCH AUTO BUS TRANSFER SWITCH AUTO ENGINE GENERATOR CONNECTED TO RESPECTIVE BUS

ALTERNATE TRANSFER RELAY 1

NORMAL

115v AC TRANSFER BUS 2

115v AC MAIN BUS 2

SFS

Southeast Flight Support

Boeing 737-300/400/500 Electrical Power Controls & Monitoring Schematic

2 0 50

DO

LOW OIL PRESSURE HIGH OIL TEMP

120 50 100 0

AMPS

VOLTS

30 130

DISCONNECT DRIVE TEMP RISE 120

.

20 0

DC VOLTS

40

VOLTS

100 0

IN DRIVE CAN BE RECONNECTED ONLY ON GRD

30 130

10 RISE 20 0

APU GEN

TR 1 BAT BAT BUS STBY PWR

TR 2 TR 3 TEST

160

40

GEN 1

GEN 2

GRD PWR STBY PWR

INV

30

80 IN 120

GEN DRIVE OIL TEMP ºC

FAN AIR

. . .

TEST

GEN GEN 2 DRIVE

. .

VOLT REG

TRANSFER BUS OFF

.

BUS OFF GEN OFF BUS

100 50

FROM GENERATOR 1

.

150 AC AMPERES

0

OFF ON GEN 2

GENERATOR BUS 2

GENERATOR BUS 1 BUS TRANS O F F

115v AC TRANSFER BUS 1

A U T O

115v AC TRANSFER BUS 2

TR 2

DC BUS 2

SFS

Southeast Flight Support

Boeing 737-300/400/500 DC Power System Schematic BUS TRANS A U T O

O F F

115v AC GROUND SERVICE BUS

115v AC MAIN BUS 2

115v AC TRANSFER BUS 1

115v AC TRANSFER BUS 2

TR 1

TR 2

BATT CHGR

TR 3 DISCONNECT RELAYº .

º

.

.

DC BUS 1

TR 3

DC BUS 2

.

BATTERY BUS

NORMAL

BATTERY BUS CONTROL BATTERY OFF AUTO STANDBY POWER ALTERNATE SWITCH HOT BATTERY BUS

. .

TO APU STARTER

.

BATTERY CONDITION: INFLIGHT BATTERY SWITCH STANDBY POWER SWITCH BUS TRANSFER SWITCH GENERATOR BUSSES

ON AUTO AUTO POWERED

OFF

.

ON

º

º

SWITCHED HOT BAT BUS EXTERNAL DC RECEPTACLE

BATTERY SWITCH

SFS

Southeast Flight Support

Boeing 737-300/400/500 Standby Power System Schematic

TRANSFER BUS NO. 1 OFF BAT T

ON

R

1

STANDBY POWER DC BUS NO. 1

BAT

OFF

DC STANDBY BUS

AUTO

CONDITION: INFLIGHT OR ON THE GROUND BATTERY SWITCH ON STANDBY POWER SWITCH AUTO GENERATOR BUSSES POWERED

OFF DAT

AC STANDBY BUS

DC STANDBY BUS

BATTERY BUS

ON AC STANDBY BUS

INV

HOT BATTERY BUS

STANDBY POWER

BAT

OFF

AUTO

BATTERY

CONDITION: INFLIGHT BATTERY SWITCH ON STANDBY POWER SWITCH AUTO GENERATOR BUSSES POWERED OFF

OFF BAT

DC STANDBY BUS

OR

BATTERY BUS

BAT ON

ON

AC STANDBY BUS

INV

HOT BATTERY BUS

STANDBY POWER

BAT

OFF

AUTO

CONDITION: INFLIGHT OR ON THE GROUND BATTERY SWITCH ON or OFF STANDBY POWER SWITCH BAT GENERATOR BUSSES POWERED OR NOT POWERED

BATTERY

SFS

Southeast Flight Support

Boeing 737-300/400/500 Power Plant Schematic

FAN AIR 5TH STAGE BLEED AIR 9TH STAGE BLEED AIR

BOOSTERS COMBUSTER

FAN

ACCESSORIES OIL PUMP FUEL PUMPS GENERATOR GENERATOR DRIVE STARTER TACHOMETER HYDRAULIC PUMP

TURBINES

THRUST REVERSER COMPRESSOR ENGINE FUEL SYSTEM

ENGINE IDLE CONTROL POWER MANAGEMENT CONTROL

AIR DRIVEN STARTER

FLT DECK CONTROLS & INDICATORS

ENGINE START & IGNITION SYSTEM

FROM PNEUMATIC SYSTEM

FROM FUEL SYSTEM

FROM ENGINE INDICATING SYSTEM

FROM ELECTRICAL SYSTEM

SFS

Southeast Flight Support

Boeing 737-300/400/500 Engine Fuel & Oil System Schematic TO BEARINGS & GEARBOX

LOW OIL PRESSURE

OIL RETURN

COMBUSTOR

OIL PRESS

FUEL FLOW TRANSMITTER SCAVENGER PUMPS

FUEL FLOW

MEC FUEL SHUTOFF VALVE

IDLE CONTROL

OIL FILTER

MEC PMC OIL FILTER BYPASS

C

SCAVENGER FILTER

FUEL FILLTER

OIL QUANT

OIL QUANT

FUEL FILLTER

FUEL HEATER FUEL OIL

C

FUEL /OIL HEAT EXCHANGE FIRST STAGE FUEL PUMP

FUEL VALVE CLOSED

ENGINE FUEL SHUTOFF VALVE FROM FUEL TANK

OIL PUMP

FILTER BYPASS

OIL TANK

SFS

Southeast Flight Support

Boeing 737-300/400/500 Thrust Reverser Schematic DETENT NO. 2

MAXIMUM RESERSE THRUST

DETENT NO.1 FORWARD THRUST LEVER

STOWED

REVERSE THRUST (STOWED)

REVERSED THRUST (DEPLOYED)

SYSTEM STANDBY SYSTEM B A SYSTEM

SYSTEM STANDBY SYSTEM B A SYSTEM

ENGINE 2 SYSTEM B HYDRAULIC PRESSURE

ENGINE 2 SYSTEM B HYDRAULIC PRESSURE

ACTUATOR CONTROL VALVE (STOW)

CONTROL VALVE (DEPLOY)

ACTUATOR DEPLOY

STORED & LOCKED

ISOLATED VALVE (CLOSED)

ISOLATED VALVE (OPEN)

BLOCKER DOOR FAN FLOW FAN FLOW

CASCADE VANES

TRANSLATING SLEEVE

TRANSLATING SLEEVE CASCADE VANES

SFS

Southeast Flight Support

Boeing 737-300/400/500 Engine Fire Extinguisher Schematic

DISCH

DISCH

L

L

R

R

1

2

LEFT BOTTLE DISCHARGE

RIGHT BOTTLE DISCHARGE

LEFT FIRE BOTTLE

RIGHT FIRE BOTTLE

SQUIB

SFS

Southeast Flight Support

Boeing 737-300/400/500 Flight Control Surfaces Location

FLIGHT SPOILERS

GROUND SPOILERS

FLAPS

RUDDER

SLATS TRAILING EDGE FLAPS STABILIZER AILERONS

ELEVATOR

SFS

Southeast Flight Support

Boeing 737-300/400/500 Roll Control Schematic

.

.

AILERON TRANSFER MECHANISM AILERON TRIM AILERON FEEL & CRNTERING UNIT

SPOILER MIXER FLIGHT SPOILERS AILERON

3

2

.

6

.

. . A

.

.

SPOILER

7

B

OFF

OFF

ON

ON

.

SFS

Southeast Flight Support

Boeing 737-300/400/500 Pitch Control Schematic

SPEED TRIM FAIL

MATCH TRIM FAIL

FLIGHT CONTROL COMPUTER

AIR DATA COMPUTER

RIGHT PITOT PROBE

LEFT PITOT PROBE

ELEVATOR FEEL COMPUTER

A

B

FEEL DIFF PRESS MACH TRIM ACTUATOR ELEVATOR FEEL & CENTERING UNIT

.

.

.

STABILIZER TRIM STABILIZER POSITION

. .

.

SFS

Southeast Flight Support

Boeing 737-300/400/500 Speed Brakes Schematic

4 0

1

5

3

2

6

.

7

.

.

9

.

SPOILER A

8

B

OFF

OFF

ON

ON

A

B SPOILER MIXER

GROUND SPOILER CONTROL VALVE GROUND SPOILER BYPASS VALVE

ARMED

SPEED BRAKE

FLIGHT DETENT

SPEED BRAKE DO NOT ARM

UP

SPEED BRAKE ARM

RIGHT MAIN LANDING GEAR FLIGHT SPOILERS: 2, 3, 6, 7 GROUND SPOILERS: 0, 1, 4, 5, 8, 9

SPEED BRAKE LEVER

SFS

Southeast Flight Support

Boeing 737-300/400/500

Leading Edge Devices & Trailing Edge Flaps Schematic

SLATS 2

FLAPS 2 1

3

FLAPS 4

3

4

SLATS 5

6

1

AUTO SLAT CONTROL

FROM SYS B RESERVOIR PTU SYS A

LE CONTROL

SYS B

STBY RES

.

M

TE FLAP CONTROL

. ALTERNATE FLAPS OFF

UP OFF

ARM

TE DRIVE UNIT

M

DOWN

.

AIR DATA COMPUTER

TE FLAPS

. 2

TE FLAP BYPASS VALVE

.

5

1 10 L

15

UP

FLAPS

25

4O

30

L

R COMPARATOR SWITCH

FLAP LOAD RELIEF

SFS

Southeast Flight Support

Boeing 737-300/400/500 Pilot-Static System Schematic

ELECTRIC ALTIMETER

ELECTRIC ALTIMETER

STANDBY PNEUMATIC AIRSPEED ALTIMETER

INERTIAL VERTICLE SPEED

ELECTRIC MACH AIRSPEED

AIR DATA COMPUTER NO. 1

ELECTRIC MACH AIRSPEED

INERTIAL VERTICLE SPEED

AIR DATA COMPUTER NO. 2

CAPT PITOT F/O PITOT CAPT STATIC F/O STATIC

NO. 1 AUX STATIC

NO. 2 AUX STATIC NO. 2 AUX PITOT

NO. 1 AUX PITOT

PRESSURIZATION CONTROL PITOT CAPT & F/O STATIC

PRESSURIZATION CONTROL CABIN ALTIMETER AND DIFFERENTIAL PRESSURE

NO. 1 & NO. 2 AUX STATIC ALTERNATE STATIC

ALTERNATE STATIC

SFS

Southeast Flight Support

Boeing 737-300/400/500 Fuel Schematic FUEL VALVE CLOSED

FUEL VALVE CLOSED

0 + 20 FUEL TEMP 20 + 40

40 C C

FILTER BYPASS

FILTER BYPASS

VALVE OPEN

CROSS

FEED

LOW LOW PRESSURE PRESSURE

FUEL

PUMPS

L

R

CTR LOW LOW PRESSURE PRESSURE

AFT

LOW LOW PRESSURE PRESSURE

FWD

FWD

OFF ON

AFT

ENGINE DRIVEN FUEL PUMP

OFF FUEL PUMPS

ON

1

2

ENGINE FUEL SHUTOFF VALVE MANUAL DEFUELING VALVE O

FUEL SCAVENGE SHUTOFF VALVE

FUELING STATION

BYPASS VALVE

NO. 1 TANK

.

APU BYPASS VALVE

CENTER TANK

APU FUEL SHUTOFF VALVE TO APU

CENTER TANK SCAVENGE JETPUMP

NO. 2 TANK

SFS

Southeast Flight Support

Boeing 737-300/400/500 Engine Start & Ignition System Schematic

AIR DRIVEN STARTER

BATTERY BUS

START VALVE OPEN ENGINE BLEED AIR VALVE

º º OFF º CONT FLT

GDR

º SWITCH HOLDING RELAY

M START VALVE

HIGH N2 LOW N2

º

FROM PNEUMATIC SYSTEM

STARTER CUTOUT º SWITCH

COMBUSTOR

ENGINE START BOTH

OFF GRD

CONT

IGN R

FLT

º OFF º º º CONT ºFLT º OFF º ºº CONT ºFLT GDR

AC STANDBY BUS

MEC CUTOFF

GDR

AC TRANSFER BUS

IDLE

IGN L

ºBOTH º º IGN R º

IGN L

º º

º BOTH IGN R

CONDITION: ENGINE BEING STARTED N2 ROTATION BELOW STARTER CUTOUT SPEED

FROM FUEL SYSTEM

º º º

Z

LEFT IGNITER Z

º º º BLEED AIR FUEL

RIGHT IGNITER

SFS

Southeast Flight Support

Boeing 737-300/400/500 Yaw Control Schematic (after RSEP modification)

YAW DAMPER

.

.

.

.

.

YAW DAMPER OFF ON

RUDDER TRIM

RUDDER FEEL & CENTERING UNIT

YAW DAMPER COUPLER

RUDDER

.

CONTROL VALVE

RPL YAW DAMPER

B

. A

RUDDER PCU FFM

CONTROL VALVE

RPR

STANDBY HYD AOTO-ON LOGIC

STANDBY HYD PUMP

. STANDBY RUDDER PCU STANDBY STANDBY RUDDER SHUTOFF VALVE

SFS

Southeast Flight Support

Boeing 737-300/400/500

Standby Hydraulic System (before RSEP modification) and (after RSEP modification)

.

FLT CONTROL A B

.

B

STANDBY HYD

STBY RUD

STBY RUD

OFF

OFF

A ON

B ON

LOW QUANTITY LOW PRESSURE

ALTERNATE FLAPS OFF

LOW LOW PRESSURE PRESSURE

UP OFF DOWN

ARM TRAILING EDGE FLAP BYPASS VALVE

TRAILING EDGE DRIVE UNIT

º º

mn

º º

FROM SYSTEM B RESERVOIR STBY RES

.

M

TO EXTEND L.E. DEVICES

TO THRUST RESERSERS

STANDBY RUDDER SHUTOFF VALVE

RUDDER FLIGHT CONTROL SHUTOFF VALVE A

ELEVATOR & ELEVATOR FEEL COMPUTER AILERON

FLIGHT CONTROL SHUTOFF VALVE B