TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 05 Inspection and Maintenance
Page 46 Issue: 04.APR 2016
Check fuel cap for condition and proper operation.
Drain fuel at fuel tank bottom.
Remove drain valve and inspect for sediment
Fuel Lines, Hoses and Elements
Inspect fuel lines and hoses for damage, leakage and proper
routing.
Visually inspect fuel selector valve for leakage.
When refilling system after complete drain (aircraft in level
attitude):
Check indication and low level warning operation.
Indicator must not start indication of usable fuel when total
fuel quantity in system is below published unusable quantity
of 5 Liter per side. Low level warning must trigger at steady
quantity of 10 Liter per side.
Check instruments for condition, security and proper
markings. (Instrument dials or markings may not be
excessively faded out due to sunlight.)
Check instrument lines and wiring for condition, proper
routing, and security.
Check Pitot-static system for condition, proper installation
and security.
Check Pitot-static system moisture traps, clean as required.
Perform Pitot-static system leak test:
Pitot: pressurize to 100 KIAS, allowable drop 5 knots/min
Static: evacuate to 1000 ft., allowable drop 100 ft./min.
Note: allow vertical speed indicator (on EFIS) to stabilize
before taking measurement. Most likely points of leakage are
the instruments themselves and hose connections.
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