ASA AIRCRAFT INSTRUMENT SYSTEMS
STUDY GUIDE 2026 COMPREHENSIVE
PRACTICE QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES
FOR FAA AVIATION EXAM PREPARATION
1 (8586) - An aircraft magnetic compass is swung to up-date the compass
correction card when - CORRECT ANSWER -C- equipment is added that
could effect compass deviation
2 (8587) - The operating mechanism of most hydraulic pressure gauges is -
CORRECT ANSWER -A- a Bourdon tube.
3 (8588) - What is the fixed line mark attached to the compass bowl of a
magnetic compass called? - CORRECT ANSWER -B- Lubber line.
4 (8589) - (1) Aircraft instruments are color-coded to direct attention to
operational ranges and limitations.(2) Aircraft instruments range markings
are not specified by Title 14 of the Code of Federal Regulations but are
standardized by aircraft manufacturers.Regarding the above statements, -
CORRECT ANSWER -A- only No. 1 is true.
5 (8590) - When swinging a magnetic compass, the compensators are
adjusted to correct for - CORRECT ANSWER -A- magnetic influence
deviation.
,6 (8591) - What will be the result if the instrument static pressure line
becomes disconnected inside a pressurized cabin during cruising flight? -
CORRECT ANSWER -A- The altimeter and airspeed indicator will both read
low.
7 (8592) - The maximum deviation (during level flight) permitted in a
compensated magnetic direction indicator installed on an aircraft
certificated under Federal Aviation Regulation Part 23 is - CORRECT
ANSWER -C- 10°.
8 (8593) - Magnetic compass bowls are filled with a liquid to - CORRECT
ANSWER -C- dampen the oscillation of the float.
9 (8594) - Instrument static system leakage can be detected by observing
the rate of change in indication of the - CORRECT ANSWER -C- altimeter
after suction has been applied to the static system to cause a prescribed
equivalent altitude to be indicated
10 (8595) - The maximum altitude loss permitted during an unpressurized
aircraft instrument static pressure system integrity check is - CORRECT
ANSWER -C- 100 feet in 1 minute.
11 (8596) - Which statement regarding an aircraft instrument vacuum
system is true? - CORRECT ANSWER -A- Dry-type vacuum pumps with
carbon vanes are very susceptible to damage from solid airborne particles
and must take in only filtered air.
, 12 (8597) - When an aircraft altimeter is set at 29.92" Hg on the ground,
the altimeter will read - CORRECT ANSWER -A- pressure altitude.
13 (8598) - Which of the following instrument discrepancies could be
corrected by an aviation mechanic?1. Red line missing.2. Case leaking.3.
Glass cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at
line B nut.7. Will not adjust.8. Fogged. - CORRECT ANSWER -C- 1, 4, 5, 6.
14 (8599) - Which of the following instrument discrepancies would require
replacement of the instrument?1. Red line missing.2. Case leaking.3. Glass
cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at line B
nut.7. Will not zero out.8. Fogged - CORRECT ANSWER -A- 2, 3, 7, 8.
15 (8600) - Which instrument condition is acceptable and would not
require correction?1. Red line missing.2. Case leaking.3. Glass cracked.4.
Mounting screws loose.5. Case paint chipped.6. Leaking at line B nut.7. Will
not zero out.8. Fogged. - CORRECT ANSWER -B- 5
16 (8601) - A barometric altimeter indicates pressure altitude when the
barometric scale is set at - CORRECT ANSWER -A- 29.92" Hg.
17 (8602) - A Bourdon tube instrument may be used to indicate1.
pressure.2. temperature.3. position. - CORRECT ANSWER -A- 1 and 2.
18 (8603) - A turn coordinator instrument indicates - CORRECT ANSWER -
C- both roll and yaw.
STUDY GUIDE 2026 COMPREHENSIVE
PRACTICE QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES
FOR FAA AVIATION EXAM PREPARATION
1 (8586) - An aircraft magnetic compass is swung to up-date the compass
correction card when - CORRECT ANSWER -C- equipment is added that
could effect compass deviation
2 (8587) - The operating mechanism of most hydraulic pressure gauges is -
CORRECT ANSWER -A- a Bourdon tube.
3 (8588) - What is the fixed line mark attached to the compass bowl of a
magnetic compass called? - CORRECT ANSWER -B- Lubber line.
4 (8589) - (1) Aircraft instruments are color-coded to direct attention to
operational ranges and limitations.(2) Aircraft instruments range markings
are not specified by Title 14 of the Code of Federal Regulations but are
standardized by aircraft manufacturers.Regarding the above statements, -
CORRECT ANSWER -A- only No. 1 is true.
5 (8590) - When swinging a magnetic compass, the compensators are
adjusted to correct for - CORRECT ANSWER -A- magnetic influence
deviation.
,6 (8591) - What will be the result if the instrument static pressure line
becomes disconnected inside a pressurized cabin during cruising flight? -
CORRECT ANSWER -A- The altimeter and airspeed indicator will both read
low.
7 (8592) - The maximum deviation (during level flight) permitted in a
compensated magnetic direction indicator installed on an aircraft
certificated under Federal Aviation Regulation Part 23 is - CORRECT
ANSWER -C- 10°.
8 (8593) - Magnetic compass bowls are filled with a liquid to - CORRECT
ANSWER -C- dampen the oscillation of the float.
9 (8594) - Instrument static system leakage can be detected by observing
the rate of change in indication of the - CORRECT ANSWER -C- altimeter
after suction has been applied to the static system to cause a prescribed
equivalent altitude to be indicated
10 (8595) - The maximum altitude loss permitted during an unpressurized
aircraft instrument static pressure system integrity check is - CORRECT
ANSWER -C- 100 feet in 1 minute.
11 (8596) - Which statement regarding an aircraft instrument vacuum
system is true? - CORRECT ANSWER -A- Dry-type vacuum pumps with
carbon vanes are very susceptible to damage from solid airborne particles
and must take in only filtered air.
, 12 (8597) - When an aircraft altimeter is set at 29.92" Hg on the ground,
the altimeter will read - CORRECT ANSWER -A- pressure altitude.
13 (8598) - Which of the following instrument discrepancies could be
corrected by an aviation mechanic?1. Red line missing.2. Case leaking.3.
Glass cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at
line B nut.7. Will not adjust.8. Fogged. - CORRECT ANSWER -C- 1, 4, 5, 6.
14 (8599) - Which of the following instrument discrepancies would require
replacement of the instrument?1. Red line missing.2. Case leaking.3. Glass
cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at line B
nut.7. Will not zero out.8. Fogged - CORRECT ANSWER -A- 2, 3, 7, 8.
15 (8600) - Which instrument condition is acceptable and would not
require correction?1. Red line missing.2. Case leaking.3. Glass cracked.4.
Mounting screws loose.5. Case paint chipped.6. Leaking at line B nut.7. Will
not zero out.8. Fogged. - CORRECT ANSWER -B- 5
16 (8601) - A barometric altimeter indicates pressure altitude when the
barometric scale is set at - CORRECT ANSWER -A- 29.92" Hg.
17 (8602) - A Bourdon tube instrument may be used to indicate1.
pressure.2. temperature.3. position. - CORRECT ANSWER -A- 1 and 2.
18 (8603) - A turn coordinator instrument indicates - CORRECT ANSWER -
C- both roll and yaw.
