PLT178: Gas Balloon Flight Operations
What code PLT178 covers, why the FAA tests it, and how to study Gas Balloon Flight Operations before your checkride.
Recall balloon - flight operations / gas
What this means for your checkride
A gas balloon naturally seeks its equilibrium altitude and can fly level for long periods with little pilot input, unlike a hot air balloon that must be reheated to hold altitude. To climb, the pilot jettisons ballast such as sand or water; to descend, the pilot releases lifting gas through a valve at the top of the envelope. Because ballast is effectively the fuel of a gas balloon, altitude changes are planned strategically and made gradually.
Gas balloon altitude control uses ballast and gas valving rather than heat, so pilots must understand this different set of controls.
Venting gas is not freely reversible. Once lifting gas is valved off it is gone, just as jettisoned ballast cannot be recovered, so both must be spent deliberately.
Where to study it
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.