FAA Question Pitot-Static Interments

11-1 AMA096

Which instruments are connected to an aircraft’s static pressure system only?

1. Vertical speed indicator

2. Cabin altimeter

3. Altimeter

4. Cabin rate-of-change indicator

5. Airspeed indicator

A—2 and 4

B—1 and 3

C—2, 4, and 5

11-1. Answer B. JSAT 11A
The airspeed indicator is connected to both the pitot and static systems, and cabin instruments are not connected to outside references.

11-4 AMA076

1. An airspeed indicator measures the differential between pitot and static air pressures surrounding the aircraft at any moment of flight.

2. An airspeed indicator measures the differential between pitot and cabin air pressures at any moment of flight.

Regarding the above statements,

A—both No. 1 and No. 2 are true.

B—only No. 2 is true.

C—only No. 1 is true.

11-4. Answer C. JSAT 11A, FAH
Airspeed indicators are sensitive instruments which measure the difference between the pitot and static pressures.

11-6 AMA096

What will be the result if the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight?

A—The altimeter will read low and the airspeed indicator will read high.

B—The altimeter and airspeed indicator will both read low.

C—The altimeter and airspeed indicator will both read high.

11-6. Answer B. JSAT 11A, FAH
An aircraft’s altimeter and airspeed indicator rely on the static pressure reading to accurately indicate their readings. The altimeter displays altitude as a function of outside (ambient) pressure, a reading which comes from the static system. The airspeed indicator displays a reading by comparing the total pressure in the pitot system to the static pressure reading. If the static pressure value being supplied to both of these systems is coming from a pressurized cabin, it will cause the altimeter and the airspeed indicator to both read low.

11-9 AMA076
When an aircraft altimeter is set at 29.92 inches Hg on the ground, the altimeter will read

A—field elevation.
B—density altitude.
C—pressure altitude.

11-9. Answer C. JSAT 11A, FGH
When an altimeter is set at 29.92 in. Hg on the ground, it reads pressure altitude.

11-10 AMA076
A barometric altimeter indicates pressure altitude when the barometric scale is set at

A—field elevation.
B—14.7 inches Hg.
C—29.92 inches Hg.

11-10. Answer C. JSAT 11A, FGH
When an altimeter’s barometric scale is set at 29.92 in. Hg, the altimeter indicates the pressure altitude.

11-27 AMA076
Which instruments are connected to an aircraft’s pitot static system?

1. Vertical speed indicator

2. Cabin altimeter

3. Altimeter

4. Cabin rate-of-change indicator

5. Airspeed indicator

A—1, 2, 3, 4, and 5
B—1, 2, and 4
C—1, 3, and 5

11-27. Answer C. JSAT 11A, FAH
Vertical speed indicators, altimeters, and airspeed indicators all make use of the aircraft’s pitot static system.