MD Helicopters 369 Series, Manual

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CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
Page 202
Revision 27
08−10−00
CG(in) =
Moment (in − lb)
Weight (lb)
(3). Moment: Product of weight of a part
and its arm, either longitudinal or
lateral, and is expressed in inch−
pounds (in−lb).
Longitudinal moment = weight x
longitudinal arm;
Lateral moment = weight x lateral arm.
(4). Reaction point: A fixed point on helicop-
ter where weight of helicopter counter-
acts on a weighing device. The main
reaction points are;
(a). ALL: Long. Sta. 96.9.
(b). 369D/E/FF − 500N: Lat. Sta.
±
25.6.
(c). 600N: Lat. Sta.
±
26.0.
(d). 369D/E/FF: Tail reaction point is at
Long. Sta. 197.2, Lat. Sta. 0.0.
(e). 500N: Tail reaction point is at Long.
Sta. 275.4, Lat. Sta. 0.0.
(f). 600N: Tail reaction point is at Long.
Sta. 303.3, Lat. Sta. 0.0.
2. Helicopter Weighing
Forms
Nomenclature
Form
No.
Figure
No.
Weight and Balance Report 765B 206
Surplus and Missing Items 1702 207
Basic Weight and Balance
Record
885 208
D
The controls access panel (aft side of Sta.
78.5 bulkhead) and the fuel cell access
panels must be installed before jacking
helicopter.
D
369D/E/FF − 500N: There are two meth-
ods approved for weighing the helicopter.
The preferred method is by using elec-
tronic weighing equipment. If equipment
for electronic weighing is unavailable, the
second approved method, mechanical
scales, may be used.
D
600N: There is one method approved for
weighing the helicopter. The method is by
using electronic weighing equipment.
A. Helicopter Weighing Preparation
The following items are required and should be
readily available prior to preparing and
weighing the helicopter, using the electronic
weighing method.
Special Tools
(Ref. Section 91 − 00 − 00)
Item Nomenclature
ST202 Jack fittings
NOTE:
D
Weigh helicopter without fuel if possible.
D
369D/E/FF − 500N: If fuel is drained from
low point in cell, 1.4 pounds (0.64 kg) of
trapped fuel at 93.5 inch (237.5 cm) arm
will remain. If fuel is pumped out using
start pump, 3.7 pounds (1.68 kg) of
trapped (unusable) fuel at 93.5 inch
(237.5 cm) arm will remain.
D
600N: If fuel is drained from low point in
cell, 1.6 pounds (0.73 kg) of trapped (un-
usable) fuel at 93.5 inch (237.5 cm) arm
will remain. If fuel is pumped out using
start pump, 9.5 pounds (4.31 kg) of
trapped (unusable) fuel at 93.5 inch
(237.5 cm) arm will remain.
(1). If defueling is not possible, ensure that
fuel cell is full.
(a). Fluid weights at 70
°
ambient are:
Fuel (Jet A)
6.75 Lb (3.06 kg) per U.S. gallon
CAUTION