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Brake release when weighing on scales

Aviation Mechanic General (AMG) practice question 3 of 25 on Weight and Balance. ACS element AM.I.C.K2 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONWhen an aircraft is weighed with its wheels on the scales, why are the brakes released?

  1. ATo allow the nosewheel strut to be deflated for leveling
  2. BTo let the aircraft settle to the center of each platform without chocks
  3. CTo reduce incorrect readings caused by side loads on the scales
Show the answer and explanation

Correct answer: C. To reduce incorrect readings caused by side loads on the scales

  • A — incorrect Leveling on the wheels is done by adjusting nosewheel strut air pressure, but that is unrelated to brake release.
  • B — incorrect Chocks or blocks are used to hold the aircraft on the scales; brake release is about avoiding side loads, not about positioning.
  • C — correct The handbook directs that brakes be released when weighing with the wheels on the scales to reduce the possibility of incorrect readings caused by side loads.

BACKGROUND

When an aircraft is weighed with its wheels on scales, side loads can be transmitted into the scales and distort the readings. Releasing the brakes reduces that possibility. Chocks, blocks, or sandbags are then used to hold the aircraft, and their weight is accounted for as tare weight. Care must also be taken to prevent the aircraft from falling or rolling off the scales or jacks.

STUDY TIP

Link brake release with side loads on the scales, and chocks with tare weight.

KEY POINTS

  • Release the brakes when weighing on the wheels.
  • Side loads on scales cause incorrect readings.
  • Chocks holding the aircraft are tare weight.

SOURCES

  • FAA-H-8083-30B ch06 "Preparing an Aircraft for Weighing - Other Considerations"
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MORE ON WEIGHT AND BALANCE

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.