Safety, Ground Ops & Servicing
What three shop housekeeping or layout practices reduce hazards?
Keep shops/hangars/flightline clean and orderly; store and remove personal tools/rollaway boxes/work stands/hoses/cords at shift change; mark and maintain safety lanes/pedestrian walkways/fire lanes and post signs for hazardous equipment and fire/first‑aid locations.
State the three elements of the fire triangle required to sustain combustion.
Oxygen, Heat, Fuel.
For light land planes, why is some slack required in manila tie‑down rope and which knot is recommended in the handbook?
Manila rope shrinks when wet, so about 1 inch of slack is provided to allow movement without putting inverted flight stresses on the aircraft; recommended knot: anti‑slip knots such as the bowline.
What are two primary pre‑start clearance or positioning steps required before starting any aircraft engine on the ramp?
- Position aircraft to head into prevailing wind for adequate airflow and cooling.
- Clear area of personnel, equipment, and FOD from intake and exhaust hazard zones and ensure a designated fireguard is standing by with a suitable CO2 extinguisher.
Name the two general types of aviation fuel and one identification (grade or color) used for AVGAS grades.
Two general types: Aviation gasoline (AVGAS) for reciprocating engines and turbine (Jet) fuel for turbine engines (JET A, JET A‑1, JET B). AVGAS grades and colors: 80 = red, 100 = green, 100LL = blue, 115 = purple.
Explain two human factors from the chapter that commonly degrade AMT performance and one practical mitigation for each.
- Fatigue — mitigation: schedule/rest management and awareness training to avoid fatigue, incorporate fatigue countermeasures.
- Poor communication (or distraction/deadline pressure) — mitigation: establish clear communications, tool control, briefings, and standardized handoffs.
Match these extinguisher types to the fire classes they are best for: water, CO2, multipurpose dry chemical, dry powder.
- Water — Class A (ordinary combustibles).
- Carbon dioxide (CO2) — Class B and Class C (also can be used on some Class A; chapter describes CO2 for A, B, C but warns about confined spaces and cold surfaces).
- Multipurpose dry chemical — Classes A, B, C (and commonly used multipurpose).
- Dry powder — Class D (metal fires) — dry powder best for Class D; not recommended for general aircraft use except metal fires.
List four standard tie‑down points on a heavy aircraft illustrated in the chapter.
Aft fuselage tiedown ring
nose landing gear tiedown loop
underside of wing tiedown loop (wingtip or outer wing tiedown loop)
main gear wheel tiedown loop (or main landing gear tiedown points)
Outline the general starting sequence steps common to turboprop engines (brief list).
- Turn boost/fuel pumps on.
- Set power lever to START.
- Engage starter (air‑turbine or electrical) to spool engine.
- Activate ignition as required; introduce fuel by moving condition lever to ON.
- Observe exhaust gas temperature/ITT and N speeds; if within limits, starter disengages; monitor oil pressure and temperatures; advance to idle when stabilized.
Distinguish dissolved water vs free water in fuel and explain the operational risk each poses.
- Dissolved water: water vapor dissolved in fuel; not usually problematic until temperature or conditions cause it to come out of solution. - Free water: liquid water that separates and can appear as water slugs or entrained droplets; risk: free water can form ice crystals and clog filters and orifices, and water slugs can cause engine flameouts or contamination leading to engine failure.
Describe the minimum responsibilities of a “fireguard” during engine start operations.
Stationed adjacent to outboard side of engine in view of pilot; equipped with suitable CO2 extinguisher (minimum 5‑lb for start); observe engine and induction/exhaust for fire; be prepared to direct extinguisher into air intake or extinguish external fire; follow safety practices while standing by.
Describe the operational difference between self‑expelling and cartridge/pressurized extinguishers and the safety implication for personnel.
Self‑expelling (e.g., CO2) have stored pressure that expels agent immediately when actuated;
cartridge/pressurized types use a separate cartridge or stored pressure that is released by breaking a seal/frangible disk — once discharged they are spent.
Safety implication: Cartridge/frangible‑seal units can have abrupt discharge and must be inspected for seals/pressure; both types can become very cold (CO2) and present frostbite risk; after activation unit must be replaced/recharged and cannot be reused until serviced.
Explain two special tie‑down considerations/techniques for seaplanes during heavy weather.
Moor to a buoy or tie to dock; account for wave action — mooring must allow for bobbing/rolling. - In heavy weather, some compartments can be flooded (partially sink) to help; fill floats with water if tied down on land; if possible, remove seaplane from water and tie down as land plane.
Define “hot start,” its usual cause, and immediate corrective action per the chapter.
Hot start — engine lights but exhaust gas temperature exceeds specified limits, usually caused by excessively rich fuel/insufficient airflow into combustion chamber (too much fuel or too little air). Immediate action: shut off fuel immediately (stop the start); record peak temperature and follow shutdown/inspection procedures.
List eight pre‑fueling procedural checks an individual must perform before fueling an aircraft with a mobile fuel truck.
- Ensure all aircraft electrical systems and electronic devices (including radar) are turned off. - Remove loose items from shirt pockets; do not carry potential spark sources. - Ensure no ignition sources (flame devices) on personnel. - Verify correct type and grade of fuel (do not mix AVGAS and jet fuel). - Ensure sumps have been drained (check for water/contamination). - Wear eye protection and appropriate PPE (rubber gloves/apron as needed). - Position fuel truck so quick departure is possible; set handbrake and chock wheels. - Ground aircraft and fuel truck, then bond them together with grounding/bonding wires; ground nozzle to aircraft before opening tank.
For working around compressed gases, list four required precautions the chapter specifies to prevent injury or equipment damage.
- Inspect air hoses frequently; replace unsafe hoses.
- Keep all connections free of leaks; maintain inline oilers and water sumps drained.
- Never use compressed air to clean hands/clothing; never spray compressed air at personnel.
- Use tire cages and pressure regulators when inflating high‑pressure aircraft tires; use appropriate devices for heavy tire mounting.
Explain why Halon agents were widely used and summarize the EPA restriction note the chapter includes.
Halon agents (e.g., Halon 1211, Halon 1301) were widely used because they rapidly extinguish Class B/C fires by removing oxygen and chemically interrupting combustion and leave little residue;
EPA has restricted Halon production to its 1986 production level because of ozone‑depleting effects (Halon restricted by EPA). Also chapter notes toxicity differences across Halons and that some (e.g., carbon tetrachloride/Halon 104) are toxic and not approved.
For helicopters left outdoors during forecast high winds, list five securing steps recommended by the chapter.
- Face helicopter toward anticipated highest wind direction.
- Spot helicopter slightly more than one rotor span from other aircraft.
- Place wheel chocks fore and aft of wheels (or for skids, retract ground‑handling wheels and install position locks or remove handling wheels).
- Align blades and install tie‑down assemblies as manufacturer prescribes; tie straps snugly without strain, with slack in wet weather to allow shrinkage.
- Fasten tie‑down ropes/cables to forward and aft landing‑gear cross tubes and secure to ground stakes or tie‑down rings; install control locks and rotor locks as appropriate.
Describe the hand‑propping safety protocol including communication phrases and three critical physical precautions.
Communication: Person swinging propeller calls “Fuel on, switch off, throttle closed, brakes on.” Person operating confirms and repeats; the prompter then calls “Contact” when ready and the operator turns switch on; never energize switch then call contact.
Three precautions:
- Assume ignition may be on; ensure the propeller is grasped correctly (push with palms, not fingers curled) and stand clear to step away as prop is pulled down.
- Ensure ground is firm to prevent slips; never lean toward the propeller.
- Stand such that you can step away safely in case brakes fail; do not force rotation if hydraulic lock suspected — remove plugs if necessary.
Explain static electricity fueling risk and the grounding/bonding sequence the chapter prescribes when fueling from a truck.
Risk: Fuel flowing creates static electricity and airframe may accumulate charge in flight; if not dissipated prior to refueling, a spark between fuel truck and aircraft (or nozzle) can ignite fuel vapors. Grounding/bonding sequence: Ground aircraft to earth, ground fuel truck to earth (if truck not permanently grounded), then bond truck-to-aircraft (or run a connecting wire between aircraft and fuel truck). Ground the nozzle to aircraft before opening fuel tank. Remove grounding wires in reverse order after fueling; if aircraft not moved soon, aircraft ground may remain attached. Do not use exhaust or propeller as grounding point — use bare metal grounding points provided.
Synthesize the chapter’s guidance to create a short stepwise SOP (5–7 bullets) for a safe pre‑start external inspection and area preparation for a turbine aircraft on the ramp.
- Position aircraft into prevailing wind where possible and clear intake/exhaust hazard areas.
- Remove all protective covers and access panels; visually inspect inlet, fan/compressor blades for foreign object damage (FOD).
- Ensure all ground personnel/loose equipment cleared from intake and exhaust hazard zones; establish a clear perimeter.
- Assign a trained fireguard with a CO2 extinguisher (≥5 lb) adjacent to outboard side of engine in pilot view.
- If external power is used, verify safe disconnect procedure and cable routing so cables won’t be walked on or stressed.
- Check fuel sumps for water/contaminants; check oil and hydraulic levels per manufacturer.
- Verify starts will follow manufacturer checklist; ensure communication between ground crew and cockpit.
Given a hangar welding operation, list the required clearances, personnel, and equipment checks the chapter mandates (include minimum extinguisher rating and personnel roles).
No fuel tanks open or fuel‑system work during welding; painting not permitted. - No other aircraft within 35 feet of welding operation. - No flammable material in area. - Only qualified welders allowed; welding area roped off and placarded. - Minimum fire extinguishing equipment rating in immediate area: 20B (with 80B backup) and trained fire watches present. - Aircraft must be towable with tug attached, parking brakes released, qualified tug operator present, hangar doors open if in hangar.
Design a checklist (8–10 items) for securing a rotorcraft for a 72‑hour storm forecast, based on chapter procedures and cautions about elastomeric bearings.
- Review manufacturer maintenance manual for rotor‑secure procedures (elastomeric bearing cautions).
- Face helicopter into forecast wind direction and spot >1 rotor span from other aircraft.
- Chock wheels fore and aft; for skid helicopters, retract handling wheels and install locks or remove wheels.
- Install control locks/gust locks; set parking brake.
- Align rotor blades and install blade tie‑down assemblies; snug tie straps with slight slack for wet conditions.
- Secure rotor head/rotor brake per manufacturer instructions (check for elastomeric bearing method).
- Stow or secure ground handling wheels and internal moveable items.
- Ensure tie‑down attachments fastened to forward/aft cross tubes and anchored to ground rings; inspect for abrasion points.
- Assign watch/inspection intervals and log actions including personnel names and times.
Create a stepwise towing procedure (8–10 bullets) for moving a large aircraft with a tow tractor including team roles, communications, and safety checks drawn from Chapter 1.
(example stepwise procedure): - Assign a qualified person in the flight deck to operate brakes and monitor communications. - Person in charge assigns wing walkers and tail walker as needed for clearance and tight turns. - Inspect tow bar and engagement fittings for damage; ensure tow bar is correct for aircraft type and not subject to torsion loads. - Verify nosewheel steering lock/locking scissors set for towing if applicable. - Verify aircraft parking brake status and that aircraft hydraulic/brake system is charged; chocks available in case of emergency. - Communicate hand signals/voice/ground radio procedures and emergency stop instructions to all team members. - Tow vehicle driver operates at safe speed (walking team pace) and coordinates brake applications with pilot in flight deck; do not attempt sudden starts/stops. - Do not allow anyone to walk or ride between towing vehicle and nosewheel; do not ride on outside of moving aircraft. - After position achieved, chock wheels fore and aft and install control locks/gust locks; remove tow bar per procedure and reset locking devices.
Given a scenario where microbial contamination is suspected in jet fuel storage, outline an investigative and immediate response plan informed by the chapter (include sampling/drain points and short‑term containment actions).
Answer (example plan): - Immediately stop dispensing from the suspect storage tank and isolate it (tag out). - Drain and sample sumps and low points (fuel drains/inspect/settling tanks) for free water and microbial slimes; record sample locations and times. - Notify fuel supplier and airport fuel management and follow their sampling/suspect fuel procedure. - Remove free water by draining fuel sumps and water drains; separate and contain drained liquids in appropriate containers for disposal per environmental regulations. - Inspect filter/separator elements and replace if fouled; examine filters for slime/debris and collect for lab analysis. - If microbial contamination confirmed, arrange fuel tank cleaning, biocide treatment per fuel supplier/manufacturer guidance, and retest samples until clear. - In short term, restrict aircraft fueling to certified alternate source or use only after lab clearance; document all actions and notify aircraft operators of contamination event.