ADX ADX Fuel Management and Planning 2 — Questions and Answers
Question 1: What is ETOPS fuel planning?
- Extended-range fuel planning for twin-engine aircraft on routes far from adequate diversion airports (Correct answer)
- Fuel planning specifically for engine ground-run testing at line maintenance
- Emergency reserve fuel carried on all transoceanic cargo-only operations
- Extra fuel loaded to safely penetrate severe turbulence at cruise altitude
Correct answer: Extended-range fuel planning for twin-engine aircraft on routes far from adequate diversion airports
ETOPS fuel planning requires carrying sufficient fuel to divert to an adequate airport within the approved ETOPS diversion time at single-engine drift-down speed.
Question 2: What is 'fuel tankering'?
- Loading extra fuel at a lower-cost departure station to minimize or avoid refueling at a higher-cost destination (Correct answer)
- Transferring fuel between aircraft in flight using a tanker aircraft
- An emergency procedure used when the destination has insufficient ground fuel supply
- The mandatory process of draining and testing fuel samples before each departure
Correct answer: Loading extra fuel at a lower-cost departure station to minimize or avoid refueling at a higher-cost destination
Fuel tankering exploits price differentials between stations by carrying surplus fuel from where it is cheap to where it is expensive, reducing overall fuel costs.
Question 3: Why is maximum zero fuel weight (MZFW) important in fuel planning?
- It limits how much payload can be loaded before fuel is added to avoid overstressing the wing roots (Correct answer)
- It specifies the maximum fuel quantity that may be loaded into the wing tanks
- It sets the minimum fuel that must be present at departure for structural reasons
- It is used solely to calculate the required landing weight at the destination
Correct answer: It limits how much payload can be loaded before fuel is added to avoid overstressing the wing roots
MZFW is a structural limit protecting the wing bending moment; if MZFW would be exceeded, payload must be reduced regardless of the fuel required.
Question 4: How is estimated time en route (ETE) used in fuel calculations?
- It is multiplied by the aircraft's fuel flow rate to estimate the fuel volume burned for a flight segment (Correct answer)
- It determines the scheduled off-block departure time for the flight
- It is used to calculate applicable airport landing and handling fees
- It determines the minimum crew rest requirement between duty periods
Correct answer: It is multiplied by the aircraft's fuel flow rate to estimate the fuel volume burned for a flight segment
Multiplying ETE by the fuel flow rate (in pounds or kilograms per hour) gives the dispatcher the estimated fuel burn for that segment of the flight.
Question 5: What is the key difference between 'block fuel' and 'trip fuel'?
- Block fuel covers engine start through engine shutdown including taxi; trip fuel covers only the airborne en-route segment (Correct answer)
- Block fuel is the minimum regulatory requirement while trip fuel is the maximum permitted load
- Block fuel and trip fuel are synonymous terms used interchangeably in dispatch documents
- Block fuel applies to cargo operations only while trip fuel applies to passenger flights
Correct answer: Block fuel covers engine start through engine shutdown including taxi; trip fuel covers only the airborne en-route segment
Block fuel is the total fuel from engine start at the gate to engine shutdown at the destination, encompassing taxi, takeoff, cruise, descent, and landing taxi.
Question 6: Which regulation specifically governs fuel requirements for 14 CFR Part 121 domestic operations?
- 14 CFR Part 121 Subpart U, including sections 121.639 and 121.645 (Correct answer)
- 14 CFR Part 91, which applies to all civil aircraft operating in the US
- 14 CFR Part 135, which governs commuter and on-demand operations
- 14 CFR Part 61, which governs pilot certification and currency requirements
Correct answer: 14 CFR Part 121 Subpart U, including sections 121.639 and 121.645
Subpart U of Part 121 (sections 121.639–121.647) contains the specific fuel requirements for domestic, flag, and supplemental operations under Part 121.
ADX ADX Fuel Management and Planning 2
What is ETOPS fuel planning?