737 GENERAL -- AIRPLANE TOWING General
You tow the airplane with a towbar that connects to the nose gear tow fitting.
You install a special eyebolt on each main gear to move the airplane in non-normal conditions or to moor the airplane.
You can also tow the airplane with towbarless equipment.
WARNING: WHEN YOU TOW THE AIRPLANE, ALL PERSONS MUST STAY OUT OF THE DANGEROUS AREAS AROUND THE TOW VEHICLE, TOW BAR, AND NOSE WHEELS. PERSONNEL ON THE GROUND MUST BE AWARE OF THE POSSIBILITY OF BEING RUN OVER BY THE NOSE WHEELS. THE TOW VEHICLE, TOW BAR, AND AIRPLANE WILL CHANGE POSITION DURING PUSHBACK AND TOWING. MAINTAIN A MINIMUM OF 10 FEET SEPARATION BETWEEN PERSONS ON THE GROUND AND THE EQUIPMENT THAT MOVES. A FATAL INJURY COULD OCCUR.
See part two of the maintenance manual for more information about towing the airplane.
737-600/700/800/900 TRAINING MANUAL
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NOSE GEAR TOW FITTING MAIN LANDING GEAR TOW FITTING
737 GENERAL - AIRPLANE TOWING
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737 GENERAL -- TOWING OPERATION General
You push or pull the airplane with a suitable tow vehicle. The design of the airplane lets you tow the airplane from the nose or the main landing gear.
You normally tow the airplane by the nose gear. A tow bar from a tow vehicle connects to a fitting on the nose gear. The maximum turn angle is 78 degrees for normal towing. Red stripes on the nose gear doors show this towing limit. Disconnect the nose gear torsion link for turn angles more than 78 degrees. Disconnect the torsion link and the taxi light cable for turn angles more than 90 degrees.
You use a towbarless equipment to move the airplane as an alternate tow vehicle.
You tow from the main gear for unusual towing conditions such as towing on soft ground or on an incline. This prevents loads more than the nose gear structural limits. A tow fitting connects to an eye in the jacking cone on each main gear. A locally fabricated cable connects this cable to the tow vehicle. The maximum turn angle is 30 degrees when you tow from the main gear.
737-600/700/800/900 TRAINING MANUAL
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MAX STEERING
ANGLE
30 DEG
78 DEG
SEE NOTES 1 AND 2
NOTES: 1. DISCONNECT NOSE GEAR TORSION LINK WHEN TOWING AT ANGLES >78 DEG
2. DISCONNECT TORSION LINK AND
TAXI LIGHT CABLE WHEN TOWING
AT ANGLES >90 DEG
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737 GENERAL -- JACKING POINTS General
These are seven jacking points to lift and stabilize the airplane. The jacking points consist of three main and four auxiliary jack points.
The main jack points are the wing jack points A and B, and the aft body jack point C. These jack points allow you to connect jacks and lift the complete airplane.
The four auxiliary jack points are the forward body jack point, the nose gear axle jack point, and the two main gear axle jack points. The forward body jack point at position D stabilizes the airplane. Jack points E and F, underneath the landing gear axles, lets you remove the wheel and tire or brake assembly without jacking the complete airplane.
Before you jack the airplane, make sure that the airplane gross weight and the center of gravity are within the approved limits. For complete information about jacking and levelling the airplane, refer to Maintenance Manual Part II, Chapter 7 and 8.
737-600/700/800/900 TRAINING MANUAL
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737-600/700/800/900 TRAINING MANUAL
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JACK POINT A JACK POINT C
(WING) (AFT BODY)
JACK POINT E
(NOSE GEAR AXLE)
JACK POINT D (FORWARD BODY)
JACK POINT B (WING) JACK POINT F (MAIN GEAR AXLE)
C A
DB FEF
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737 GENERAL -- FMCS CONTROL DISPLAY UNIT General
The flight crew uses the control display unit (CDU, also called the MCDU) to put in flight data and to select displays and modes of operation. They also use the CDU to start ADIRU alignment. You use the CDU to test the FMCS and other systems.
There are two CDUs in the airplane. They are functionally and physically interchangeable.
Physical Description
The CDU has a keyboard and a display.
Line select keys (LSK) are on the left and right of the display.
The keyboard has function and mode keys and alpha-numeric keys.
The CDU has these annunciators:
-FAIL
-CALL
-MSG (message)
-OFST (offset)
-EXEC (execute).
The EXEC light is on the right of the CDU keyboard.
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