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SERIES 100
AIRCRAFT MAINTENANCE MANUAL
LEVELING AND WEIGHING
LIST OF EFFECTIVE PAGES

Chapter Chapter
Section Section
Subject Config Page Date Subject Config Page Date
08 − Effective 1 * Dec 20/2005
Pages

08 − Contents 1 Dec 20/2004

08−00−00 1 Dec 20/2004

08−10−00 1 Dec 20/2004

2 Dec 20/2004
3 Dec 20/2004
4 Dec 20/2004
5 Dec 20/2004
6 Dec 20/2004

08−20−00 1 Dec 20/2004

2 Dec 20/2004
3 Dec 20/2004

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LEVELING AND WEIGHING
TABLE OF CONTENTS

Chapter
Section
Subject Subject Page

LEVELING AND WEIGHING 08−00−00

Description and Operation 1
Effectivity: ON A/C ALL
General
Leveling
Weighing

WEIGHING OF THE AIRCRAFT 08−10−00

Description and Operation 1
Effectivity: ON A/C ALL
General
Weighing of the aircraft
Prepare Aircraft for Weighing
Weigh the Aircraft on Platform Scales 2
Weigh the Aircraft on Jacks with the Electronic 3
Load Cell Kit

LEVELING OF THE AIRCRAFT 08−20−00

Description and Operation 1
Effectivity: ON A/C ALL
General
Leveling of the Aircraft
Prepare the Aircraft for Leveling
Level the Aircraft on Wheel Axle Jacks
Level the Aircraft by Adjusting the Shock Strut
Extension
Level the Aircraft by Adjusting the Tire 2
Pressures

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**ON A/C ALL
LEVELING AND WEIGHING

1. General
A. Leveling
A leveling point is provided for leveling the aircraft laterally and longitudinally, as required
for specific maintenance tasks.
Aircraft leveling is obtained by aligning a plumb bob, suspended from a hanger, with a
target located on the front emergency exit door sill. Access to both the hanger and target
is gained by removing the emergency exit door (refer to Chapter 8−20−00).
B. Weighing
Aircraft weighing can be done using platform scales or electronic sensing devices at the
landing gear to measure the weight at each gear location. the weights are recorded to
calculate the total weight and center of gravity (refer to Chapter 8−10−00).

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**ON A/C ALL
WEIGHING OF THE AIRCRAFT

1. General
The maintenance procedure in this section is for weighing the aircraft. Platform scales or
electronic sensing devices can be used at the landing gear to measure the weight at each
gear location. The weights are recorded to calculate the total weight and the center of gravity.
The basic weight of the aircraft is that weight which includes all fixed operating equipment
both standard and optional, trapped and unusable fuel and full oil.
2. Weighing of the aircraft
Equipment and Materials:
Weighing kit Kit No. 99−8088−9000
Platform scales
Jacking adapters Tronair 02−8014−4000
Axle jacks Tronair 02−8007−0133
Nose lifting jack Tronair 02−8003−0132
Tail stand Tronair 03−8016−0000
A. Prepare Aircraft for Weighing
(1) The flight controls are in the neutral position and the gust lock engaged.
(2) The flaps are in the up position.
(3) The landing gear is down, main landing gear lock pins installed and nose gear
down lock is engaged.
(4) The passenger seats are in the upright takeoff position.
(5) The interior and exterior of the aircraft is cleaned and dry (refer to Chapter 12).
(6) Remove all consumable materials from the galley.
(7) Remove the galley supplies but do not remove emergency equipment stored in the
galley.
(8) Drain the galley liquid containers.
(9) Drain the coffeemaker water reservoir.
(10) Drain the lavatory wash water reservoir (refer to Chapter 12).
(11) Remove all the tools and equipment not included in the aircraft basic weight (see
the equipment check list).
(12) Close all doors and access panels except the forward right emergency exit door.
(13) Pressure defuel the aircraft (refer to Chapter 12).
(14) Drain the remaining fuel from the tanks through the water drains located on the
underside of the wing tanks. Drain the surge bays outboard of the wing tanks. The
remaining fuel is trapped fuel and is part of the basic weight of the aircraft (refer to
Chapter 12).
NOTE: It is not recommended for the fuel tanks to be filled and the aircraft
weighed and usable fuel subtracted.

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(15) Replenish the toilet flush fluid (refer to Chapter 12).
(16) Park the aircraft in a closed hangar (refer to Chapter 10).
(17) Replenish the No. 1 and 2 hydraulic system reservoirs (refer to Chapter 12).
(18) Replenish the engine oil system reservoirs (refer to Chapter 12).
B. Weigh the Aircraft on Platform Scales
NOTE: Wing jacks are not to be used when weighing aircraft as side loads can affect
aircraft weight and center of gravity.
(1) Make sure that the aircraft conforms to the equipment check list.
(2) Jack the aircraft and position the platform the platform scales under each landing
gear.
(3) Position the tail stand approximately 8 inches forward of the tail cone. Do not permit
the stand to make contact with the aircraft surface.
WARNING: MAKE SURE THAT THE WHEEL CHOCKS ARE IN FRONT OF
AND BEHIND THE MAIN LANDING GEAR. IF THIS IS NOT DONE
THE AIRCRAFT COULD MOKE AND CAUSE INJURIES TO
PERSONS AND/OR DAMAGE TO EQUIPMENT
(4) Put the wheel chocks on the scales and set the scales to zero.
(5) Connect the plumb bob at the forward right emergency door opening to level the
aircraft (refer to Chapter 8).
(6) Level the aircraft by adjusting the tire pressure on the main landing gear to achieve
lateral position. Adjust the tire pressure on the nose landing gear to achieve
longitudinal position of the target.
(7) If the tire pressure adjustment is not sufficient, adjust the oleo pressure of the shock
struts of the main landing gear and nose gear to make the aircraft level.
(8) Release the parking brake.
(9) Slowly remove the wheel chocks and make sure that the aircraft wheels do not
move.
(10) Record the weight at each platform scales (refer to the Weight and Balance
Manual).
(11) Put the chocks at the landing gear wheels.
(12) Jack the aircraft at the wing and nose fuselage.
(13) Remove the platform scales from under the wheels.
(14) Slowly release the wheel jack pressure and lower the aircraft onto the ground.
(15) Remove the plum bob from the forward emergency exit door.
(16) Install the forward emergency exit door.
(17) Engage the parking break.
(18) Install the wheel chocks.
(19) Charge the landing gear tires with nitrogen (refer to Chapter 12).
(20) Replenish the NLG and the MLG with nitrogen and make sure that the each strut
extension is correct (refer to Chapter 12).
(21) Refuel the aircraft as required (refer to Chapter 12).

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(22)Replenish the lavatory water system (refer to Chapter 12).
(23)Replenish the galley liquid containers (refer to Chapter 12).
(24)Replenish the galley coffeemaker water tank.
(25)Put the supplies in the galley stowage compartment.
A leveling point is provided for leveling the aircraft laterally and longitudinally, as
required for specific maintenance tasks.
C. Weigh the Aircraft on Jacks with the Electronic Load Cell Kit
NOTE: Wing jacks are not to be used when weighing aircraft as side loads can affect
aircraft weight and center of gravity.
(1) Make sure that the aircraft conforms to the equipment check list.
(2) Position the nose and main landing gear jacks under each landing gear jacking
pads.
(3) Install the load cells on the jacks (see the manufacturer’s instructions).
(4) Jack the aircraft at the landing gear axles approximately 2 inches (5.08 cm) off the
ground (refer to Chapter 7).
(5) Level the aircraft by adjusting the jacks (refer to Chapter 8−20−00).
(6) Position the tail stand approximately 8 inches (203 mm) forward of the tail cone. Do
not permit the stand to make contact with the aircraft surface.
(7) Set the measuring electronic kit to zero (see the manufacturer’s instructions).
(8) Obey all the instructions when measuring the weight of the aircraft with the
electronic load cell kit (for detail instructions refer to the manufacturer’s manual).
(9) Record the weight at each jacking point to calculate the total weight and the center
of gravity (refer to the Weight and Balance Manual).
(10) Remove the tail stand.
(11) Slowly release the wheel jack pressure and lower the aircraft onto the ground.
(12) Install the wheel chocks.
(13) Remove the plum bob from the forward emergency exit door.
(14) Install the forward emergency exit door.
(15) Remove all tools, equipment and unwanted materials from the work area.
(16) Refuel the aircraft as required (refer to Chapter 12).
(17) Replenish the lavatory water system (refer to Chapter 12).
(18) Replenish the galley liquid containers (refer to Chapter 12).
(19) Replenish the galley coffeemaker water tank.
(20) Put the supplies in the galley stowage compartment.

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STA. X423.00 AIRPLANE

MEASURING
423.0" DATUM PLATE

X WHEEL AXLELC Y Z
F A B
E
WEIGHING ON WHEELS
(PLATFORM SCALES) AIRPLANE
MEASURING
DATUM PLATE

JACKING POINTL C
X Y Z
F A B
E

WEIGHING ON LANDING GEAR JACKING POINTS

(JACKS AND LOAD CELLS)
HORIZONTAL DATUM =
HOR ARM 0.0 =
dam13_081000_003.dg, dm/gw, 27/01/97

FUS STN 0.0

NOTES
Using plumb bob mark floor on centerline of airplane to determine location of
points ‘X’ and ‘Z’ (see sheets 3 and 4) and establish measuring datum at point ‘Y’.

Horizontal datum to nose reaction location = F = 423 − A.

Horizontal datum to main reaction location = E = 423 + B.

WEIGHING OF THE AIRCRAFT

Figure 1 (Sheet 1 of 3)

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FWD
NOSE WHEEL
MEASURING DATA
0.94 in.

AXLE L
C

WHEEL
FWD
TIRE
NOSE L/G
JACKING
A
POINT
A

NOSE WHEEL
POINT ‘X’ AXLE CENTERLINE
STA. X423.00
0.94 in.
MEASURE
MARKS ON FLOOR D
POINT ‘Y’
A = D + 0.94 in.
MAIN WHEEL
MEASURING DATA

SHOCK ABSORBER
FWD
FAIRINGS
DRAG STAY
REMOVE INBOARD HUB CAPS,
MAIN GEAR INSTALL SPECIAL HUB CAPS
JACKING PAD (PART OF KIT No. 99−8088−9000)
AND STRING A LINE BETWEEN
PLUMB BOB SUSPENDED L & R MAIN WHEELS ON THE
AT CENTER OF FUSELAGE AXLE LC
TOUCHING LINE STRUNG

dam13_081000_004.dg, dm/gw, 27/01/97

BETWEEN L & R MAIN WHEELS MAIN WHEEL
AXLE LC

POINT ‘Y’ POINT ‘Z’

B MEASURE

STA. X423.00

MEASURING DATA − WEIGHING ON WHEELS

WEIGHING OF THE AIRCRAFT

Figure 1 (Sheet 2 of 3)

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INSTALL SPECIAL MEASURING

JIG (PART OF KIT No. 99−8088−9000)
NOSE L/G JACKING REFER TO PARAGRAPH 1.6.3
MEASURING DATA

LOAD
A CELL

PLUMB
FWD BOB
NOSE L/G
JACKING
POINT
A B
B
LOAD CELL
POINT ‘X’ PLUMB BOB
STA. X423.00
MEASURE
MARKS ON FLOOR ‘A’
POINT ‘Y’
MAIN L/G JACKING
MEASURING DATA

SHOCK ABSORBER
FWD
FAIRINGS
DRAG STAY
REMOVE INBOARD HUB CAPS,
MAIN GEAR INSTALL SPECIAL HUB CAPS
JACKING PAD (PART OF KIT No. 99−8088−9000)
AND STRING A LINE BETWEEN
LOAD CELL
L & R MAIN WHEEL ON THE
PLUMB BOB SUSPENDED AXLE LC
AT CENTER OF FUSELAGE MAIN WHEEL
TOUCHING LINE STRUNG AXLE LC
BETWEEN L & R MAIN WHEELS
dam13_081000_005.dg, dm/gw, 27/01/97

POINT ‘Y’ POINT ‘Z’

B = G − 5.33 in.
5.33 in.
B
MEASURE G
STA. X423.00

MEASURING DATA − WEIGHING ON L/G JACK FITTINGS

WEIGHING OF THE AIRCRAFT

Figure 1 (Sheet 3 of 3)

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AIRCRAFT MAINTENANCE MANUAL
**ON A/C ALL
LEVELING OF THE AIRCRAFT

1. General
The maintenance procedure that follows is for leveling the aircraft. The aircraft can be leveled
by jacking the aircraft at the wing and fuselage nose and adjusting the jacks or by jacking at
the landing gear axles and adjusting the jacks or by reducing the tire pressures and/or the
oleo shock struts. A leveling target plate is located at the forward right emergency door
opening and provides for leveling the aircraft laterally and longitudinally.
2. Leveling of the Aircraft
Refer to Figure 1.
Equipment and Materials:
Plumb bob
Aircraft leveling kit
Tail stand
A. Prepare the Aircraft for Leveling
(1) Remove the forward right emergency exit door from the aircraft.
(2) Suspend plumb bob from hanger at front emergency exit.
(3) Make sure that the panel located at the upper emergency exit door opening does
not make contact with the plumb bob line at station X255.00.
(4) Permit the point of the plumb bob to hang above the target plate not more than 0.5
inches (1.27 cm).
B. Level the Aircraft on Wheel Axle Jacks
CAUTION: WHEN THE AIRCRAFT IS ON JACKS MAKE SURE THAT THE TAIL
STAND IS REMOVED BEFORE THE MAIN OR NOSE JACKS ARE
ADJUSTED. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE
TO THE AIRCRAFT TAIL SECTION.
(1) Place the nose and main wheel axle jacks in position and jack the aircraft until the
wheels are approximately 2 inches (5.08 cm) off the ground.
(2) Adjust the jacks at the main wheel axles until the plumb bob point aligns with lateral
mark on the target plate at station Y42.500.
(3) Adjust the jacks at the nose wheel axle until the plumb bob point aligns with
longitudinal mark on the target plate at station X255.00.
(4) The aircraft is level when the point of the plumb bob (3) aligns with the center mark
at stations Y42.500 and X255.00 on the target plate.
(5) Position tail stand aft.
C. Level the Aircraft by Adjusting the Shock Strut Extension
(1) Adjust the main landing gear shock strut extension to move the plumb bob left or
right of the target plate until the plumb bob is above the target plate mark at station
Y42.50
(2) Adjust the nose landing gear shock strut extension to move the plumb bob forward
and aft of the target plate until the plumb bob is above the target plate mark at
station X255.00.

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(3) The aircraft is level when the point of the plumb bob aligns with the center mark at
stations Y42.500 and X255.00 on the target plate.
(4) Position tail stand aft.
D. Level the Aircraft by Adjusting the Tire Pressures
(1) Adjust the main landing gear tire pressures to move the plumb bob left or right of
the target plate (4) until the plumb bob is above the target plate mark at station
Y42.50.
(2) Adjust the nose landing gear tire pressures to move the plumb bob forward and aft
until the plumb bob is above the target plate mark at station X255.00.
(3) The aircraft is level when the point of the plumb bob aligns with the center mark at
stations Y42.500 and X255.00 on the target plate
(4) Position tail stand aft.

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AIRCRAFT LEVELING
Figure 1

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