Ground Operations and Servicing — practice questions

9% of the exam ≈5 real questions 5 free questions here

Nine percent of the weighting: fire classes and extinguishers, fuel identification and fueling safety, towing, tie-down, engine starting problems, oxygen servicing, taxi light signals and FOD.

Where people lose points

• Never use water or CO2 on a Class D (burning metal) fire such as a magnesium wheel.
• 100LL is blue, 100 is green, 80 is red; jet fuel is marked black on piping.
• Fueling grounds: aircraft, then truck, bond them, then nozzle to aircraft before the cap comes off. Never ground to the propeller.
• A hot start is an EGT overtemperature; a hung start is rpm that stalls at a low value.
• Only Aviator's Breathing Oxygen goes in an aircraft system; medical oxygen can carry water that freezes.

Questions and answers, explained

All 2 questions above, with the correct answer and why it is correct. Everything here is on ground operations and servicing.

1. During a turbine engine start, the engine lights off but exhaust gas temperature exceeds its limit. This is called

   • Aa hung start
   • Ba hot startCorrect
   • Ca false start
   • Da wet start

   Why: A hot start is when the engine starts but EGT exceeds limits, usually from an excessively rich mixture (too much fuel or not enough airflow). A hung or false start is when rpm stays at a low value instead of accelerating; shut the engine down in either case.

   Reference AM.I.F.K5 · FAA-H-8083-30B, Ch. 1 (Hot Start; False or Hung Start)

2. Why must oil and grease be kept away from oxygen fittings and servicing equipment?

   • AThey thicken in the cold and block the regulator
   • BThey can form a highly explosive mixture with oxygenCorrect
   • CThey dilute the oxygen and lower its purity
   • DThey cause the fittings to corrode quickly

   Why: Oxygen itself does not burn, but combustible materials ignite more readily and burn more intensely in an oxygen-rich atmosphere. The handbook warns oxygen can combine with oil, grease or other materials to form a highly explosive mixture sensitive to compression or impact.

   Reference AM.I.F.K8 · FAA-H-8083-30B, Ch. 1 (Oxygen Hazards)

Topics inside this domain

• Aviation fuel identification, fueling safety and fire classes

Drill other domains

• Electricity and Electronics (16%)
• Aircraft Drawings (4%)
• Weight and Balance (6%)
• Fluid Lines and Fittings (4%)
• Materials, Hardware and Processes (8%)
• Cleaning, Corrosion and Finishes (14%)

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