TM 1-1520-238-23
G-3
G.1.
HELICOPTER WEIGHING (AIRCRAFT ON JACKS) – continued
NOTE
This section describes helicopter weighing procedures with the use of aircraft jacks and electronic
load cells. Helicopter is weighed in a 3.5 degree nose up attitude with the main landing gear locked
in a collapsed position. (See figure G–1 for two view chart diagram.)
Helicopter shall be weighed in the BASIC WEIGHT condition. BASIC WEIGHT condition is established
with all doors closed, except L135 and R135, seats in the mid position, and includes usable engine and
APU oil, trapped fuel, 30mm gun and ammo magazine, and wing pylons .
Check for and remove all non-basic weight items such expendable ordnance, clipboards, helmets,
personal equipment, tools, etc.
Defuel helicopter before weighing. Helicopter Center of Gravity (CG) cannot be accurately deter-
mined when weighed with fuel on board.
Defuel helicopter on the ground attitude with the use of a defueling pump. Drain remainder of fuel
from each tank through sump drains. Sump drains are found on helicopter bottom centerline at
fuselage stations (F.S.) 172.3 and 255.4. When the fuel drainage diminishes to dripping, allow five
minutes for balance of fuel to drain.
Pylons are a part of helicopter basic weight and should be listed on DD Form 365-1 (Chart A) as
follows:
COMPARTMENT
AND
ITEM NUMBER
ITEMS AND LOCATION
(Grouped by compartment)
WEIGHT
(lbs)
ARM
(in)
MOMENT/100
ENTER CONSTANT
(in-lbs)
H
Right Wing
(F.S. 185 - 238)
H
Wing Pylon 318000001200
58
199.0
115
H
Wing Pylon 318000001
58
199.0
115
I
Left Wing
(F. S. 185 - 238)
58
199.0
115
I
Wing Pylon 318000001100
58
199.0
115
I
Wing Pylon 318000001
58
199.0
115
Perform a complete inventory of items installed on helicopter. Use Basic Weight Check List,
DD Form 365-1 found in the helicopter weight and balance file. Record all discrepancies from
DD Form 365-1 in Column I or II (as applicable) on the reverse side of the Aircraft Weighing Record,
DD Form 365-2.
Failure to weigh helicopter in the BASIC WEIGHT condition with four pylons installed will cause an
incorrect center of gravity calculation when converting from “as weighed” condition to “corrected to
level attitude” condition.
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