Game Composites GB1 GameBird, Maintenance Manual

Page: 26 / 269

Maintenance Manual GB1 GameBird
Page date: April 24, 2020
5-13
100-Hour Inspection Checklist
Repeat 25- and 50-hour inspections.
In addition, complete the following items:
Item Reference Initial
Check metal firewall and surrounding composite structure for damage and
cracks 5-06
51-01
Visual check of composite structure all over, including behind inspection
panels, for damage and cracks
51-01
Leak check pitot-static system
5-06
31-02
Shoulder belts: Open padding around load limiter
Load Limiters:
Visually inspect for correct installation and overall condition
Check gap between vertical flanges to be 6 – 8mm
25-12
Check magneto condition and timing (refer to 4300/6300 Series Magneto
Maintenance & Overhaul Manual see
www.unisonpubs.com )
Adjust timing if necessary (see Lycoming engine manual)
Visually check the engine display system for:
Leaks on or around transducers,
Loose fittings (electrical, mechanical, fluids),
Damage to wiring.
All readings and calibration information (including fuel level) should be
operating and reading properly as far as may be checked safely in the
maintenance environment.
39-01
39-04
Run engine until cylinder head and oil temperatures are in the normal range.
The test should be completed as soon as practical after shut down.
A differential compression tester is attached to the cylinder via the spark
plug hole after the piston is positioned at top dead center of the
compression stroke. Compressed air is supplied to the tester and the
regulator is adjusted to 80 PSI as air is sent is to the cylinder through the
tester. To assure that the piston rings are seated, the propeller is moved
slightly back and forth with a rocking motion. The cylinder compression
reading is taken from the gauge on the downstream side of the orifice and
r
ecorded as “X” psi in the table below.
Pressure readings for all cylinders should be nearly equal.
Lycoming guidance: A difference of 5 psi between cylinders is satisfactory; a
difference of 10 to 15 psi indicates an investigation should be made. Unless
the pressure difference exceeds 15 psi the investigation does not necessarily
mean removal of the cylinder.
A follow-on compression check should be made within the next 10 hours of
operation to determine the wear rate. If the pressure reading is below 60 psi
or if the wear rate increases rapidly, as indicated by an appreciable decrease
in cylinder pressure, removal and overhaul or replacement of the cylinder(s)
should be considered.
Cylinder 1 2 3 4 5 6
Pressure
Every third check i.e. at 300, 600, etc., flush / clean the inverted oil system. 79-03