(7)  
If you will retract the landing gear, look at the strut extension and pressure and compare it to the gear service chart.

 CAUTION:_______ THE LANDING GEAR MUST BE FULLY EXTENDED BUT NOT FULLY INFLATED
 FOR THE RETRACTION TEST.  TO PREVENT BAD DAMAGE TO THE SHOCK
 STRUT, DO NOT LIFT THE WEIGHT OFF WHEELS WITH THE SHOCK STRUTS

 (a)  Adjust the pressure in the strut if it is necessary to get the correct pressure.
 S 682-008
 (8)  Deflate the shock strut of the landing gear.
 NOTE: When you lift the airplane on jacks to make the airplane
____ level or to weigh it, or for general maintenance, it is optional to deflate the shock struts.
 S 492-009
 CAUTION:  STRUT MUST BE COMPLETELY DEFLATED AT ALL TIMES WHEN SHOCK STRUT
_______ LOCKS ARE INSTALLED. GEAR CANNOT BE RETRACTED SAFELY WHEN SHOCK STRUT LOCKS ARE INSTALLED.
 CAUTION:  BEFORE YOU DEFLATE THE STRUT MAKE SURE THE AREA BELOW THE WINGS IS CLEAR, OTHERWISE DAMAGE TO THE AIRPLANE AND EQUIPMENT CAN RESULT FROM THE WING DROPPING IN HEIGHT.
 (9)  Install the shock strut locks.
 NOTE: When you deflate the shock struts, the height that you have
____ to lift the airplane decreases. Hold the shocks struts in the compressed position with the shock strut locks shown in Fig. 202.
 S 012-010
 (10) Remove the jack pad covers from the airplane (Fig. 203).
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747-400
MAINTENANCE MANUAL

NOSE LANDING GEAR (REF)
8ME65B01202-3
BODY LANDING GEAR (REF)
8ME65B01202-3 (2 NECESSARY)
WING LANDING GEAR (REF)
8ME65B01202-3 (2 NECESSARY)
Landing Gear Shock Strut Retention Tool Installation

Figure 202

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747-400
MAINTENANCE MANUAL

VIII INTEGRAL JACK PAD
SEE  C  V  SEE  A 
TAIL JACK 
VI  II 

III
FWD I
AFT FUSELAGE INTEGRAL JACK PAD (III)
SEE D IV
A
SEE E
SEE B VII
LOWER WING PANEL JACK ADAPTER 36MIT65B00141
FWD
JACK ADAPTER 30MIT65B00112 FORWARD JACK
FWD
JACK
FORWARD BODY (NOSE) JACK ADAPTER (VI)
OUTBOARD WING JACK ADAPTER (VII AND VIII)  C
B
FLAP
TRACK
INTEGRAL
JACKING
PAD
JACK ADAPTER 50MIT65B00112
INTEGRAL JACK JACK PAD FLAP
TRACK
FAIRING
JACK FWD ACCESS PANEL FWD
REMOVED BODY INTEGRAL JACK PAD (I AND II) WING JACK ADAPTER (IV AND V)
D E
Jack Pads and Adapters Figure 203
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747-400 MAINTENANCE MANUAL
 S 492-011
 CAUTION:_______ WHEN YOU INSTALL THE JACK PAD ADAPTERS, USE THE CORRECT ATTACH
 BOLTS.  IF YOU DO NOT USE THE CORRECT BOLTS, YOU CAN CAUSE
 STRUCTURAL DAMAGE TO THE AIRPLANE.

 (11)
 Install the jack pad adapters for all the jacks you will use (Fig. 203).

 S 492-012

 (12)
 Put the jacks in the correct position (Fig. 204).

 (a)  
Put the primary jacks directly below the jack pads.

 (b)  
Make sure all the jack pads hold the weight equally.

 (c)  
Put the caster wheels in an aligned position.

 NOTE: With the caster wheels aligned, they can follow one
____ another when the jack turns clockwise (counterclockwise, where applicable).
 (d)  
　
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