
GRUMMAN AMERICAN
FOR TRAINING USE ONLY – SECTION 6
MODEL GA-7/COUGAR
WEIGHT AND BALANCE
6-3
Issued: April 10, 1978
INTRODUCTION
This section contains procedures for determining the basic empty weight and moment of the GA-7/Cougar
airplane. Sample forms and the corresponding procedure for their use are provided to enable a rapid calculation
of the weight and moment for various operations. An equipment list, provided at the end of this section, provides
weights and arms of all equipment available for the GA-7/Cougar airplane.
AIRPLANE WEIGHING PROCEDURES
NOTE
The airplane may be weighed using electronic scales or platform scales.
PREPARATION
1.
Inflate tires to recommended operating pressure.
2.
Drain all fuel from tanks and fuel system.
3.
Ensure oil and operating fluids are filled to capacity.
4.
Adjust seats to normal operating (mid range) position.
5.
Raise wing flaps to full up position.
6.
Place all controls in their neutral position.
7.
Ensure that all objects, not part of the airplane or its accessories, are removed from the airplane.
8.
Clean the airplane inside and out.
9.
Close all doors and winds.
LEVELING THE AIRPLANE
Airplane on Wheels – Using Platform Scales
1.
Place platform scales under each wheel.
2.
Place two foot carpenter levels or equivalent against bottom of fuselage as shown in Figure 6-1.
3.
Level airplane laterally and longitudinally by deflating tire(s) as required.
4.
Remove levels from beneath fuselage.
Airplane on Jack Pads – Using Electronic Scales
1.
Check the calibration of the scales.
2.
Install the pressure pads (electronic load cells) between the jacks and jack pads on the airplane.
Jack Pad Description
Jack Pad Location (Arm)
Nose
F.S. 49.8
Right and Left Main Gear
F.S. 125.10
3.
Place two carpenter levels or equivalent against bottom of fuselage as shown in Figure 6-1.
4.
Level airplane laterally and longitudinally by adjusting jack(s) as required.
5.
Remove levels from beneath fuselage.