The pressure altimeter Flashcards
State 3 parts a simple altimeter consists of
The static vent, the partial vacuum capsule, the linkage system.
Altimeters are calibrated to what standard?
The international standard atmosphere
The main aspect of a sensitive altimeter that sets it apart from the simple altimeter?
It contains three partial vacuum capsules, each one attached to a pointer indicating 10 000ft, 1 000ft and 100ft.
Which altimeter contains a QNH setting knob?
Only the sensitive altimeter
Altimeter Instrument error is?
Due to possible manufacture imperfections, wear and tear of the linkages. Another important factor is that pressure change with altitude is not constant, the change of pressure decreases with altitude.
With altimeter time lag error, during a rapid descent will the altimeter under-read or over-read?
Over-read
With altimeter time lag error, during a rapid climb will the altimeter under-read or over-read?
Under-read
Temperature error is due to?
Temperature and/or lapse rate being different than that of the ISA.
Temperature error is greatest at?
High altitude
If the static vent becomes blocked, what indication will occur?
No change in altimeter, the pointer will be stuck in the last position.
The type of altimeter that use the “E” and “I” bar system to compensate decrease in pressure change at altitude, is called?
Servo Assisted Altimeter
Which altimeter system does time lag error virtually not exist?
The servo assisted altimeter
Which altimeter type is depended on electrical power?
The servo assisted altimeter
1 hectapascals = ?
30ft
As altitude increases, pressure loss rate becomes?
less, the pressure difference between sea level and 5 000ft is 166 hPa, but the pressure difference between 35 000ft and 40 000ft is only 50 hPa.
Thus! altimeter capsule deflection progressively declines with altitude giving a false indication.
Atmospheric pressure decrease is not linear
