Pressure & Gyro Instruments Flashcards
Gyroscopic Rigidity depends on what properties: (select all of the correct answers)
Mass
Colour
Altitude
Rotor RPM
Mass distance from axis or rotation (moment)
Static Pressure
OAT
Mass, Rotor RPM and Mass Distance from Axis of Rotation (moment)
An increase in rotor mass (decreases, increases) rate of precession
What is the correct answer?
Decreases
Position Error is typically caused due to disturbences between registered static _____ and freestream ____ pressure
registered static pressure and freestream static pressure
State three in-flight ASI serviceability checks that could be performed
**1. Check ASI starts to register speed increase on the runway
- ASI indication should be as expected for a given power/aircraft configuration
- As a last resort you could conduct a stall and note the airspeed it stalls at against the correct stall speed**
Position Error mainly effects Pitot or Static vents?
Primarly the Static Vents (but can also effect the Pitot system)
If the static vent is blocked during flight, the Altimeter will (over-read, under-read, read zero, remain static/no change),
What is the correct answer?
Remain Static/No Change
The AI/AH requires how much suction for normal operation?
About 4”Hg
Increasing the distance of mass concentration from the axis of rotation (increases,decreases) gyroscopic Rigidity.
What is the correct answer?
Increases
What gyro type is the following statement describing;
Has freedom of movement in only two planes, the plane of rotation and one other, measurement about the third plane is measured by prescession of the gyro
Rate Gyro
You could check the HI/DI is serviceable while taxiing on the ground, when you turn left the number card must (increase/decrease)
What is the correct answer?
Decrease
The Attitude Indicator AI/AH uses what type of gyro?
Earth Gyro
The pictured Turn Coordinator shows the aircraft making a (left,right) turn that is (balanced,slipping,skidding).
What combination is the correct answer?
Right turn, slipping
Name the four main Gyro Types
Space, Tied, Earth, Rate
State the main precaution when using Pitot Heat on the ground
It must be used only very briefly to avoid damage caused by overheating on the ground
The Altimeter is considered serviceable if it reads +__ft and -__ft of the correct altitude on the ground
+30ft and -45ft
For the DI/HI to be deemed serviceable it must not precess (real drift) more than ___º per 15min or ___º per hour
more than 4º per 15min or 16º per hour
Serviceability of the Turn Coordinator can be checked during flight by timing and conducting a Rate 1 turn, It should take ___ min(s) to complete 180º and ___ min(s) to complete 360º
It should take 1 min(s) to complete 180º and **2 **min(s) to complete 360º
The red line at the end of the yellow arc on the ASI indicates?
VNE, Never Exceed Speed
You notice the static vent(s) are blocked and select the alternative static vent that uses cabin pressure, What effect will this have on the ASI?
Will cause a slight over read as cabin pressure is slighlty less
List three ASI pre-flight serviceability checks that should be performed
**1. Check for blocks, contamination, remove Pitot cover
- Check Pitot heater operation
- Check instrument indicates zero**
CAS is ___ corrected for _____ and _____
IAS corrected for Instrument and Position
The HI or DI uses which type of gyro?
Tied Gyro
Under what conditions should Pitot Heat be turned on?
Should be used in visible moisture where OAT is +10ºc or colder, or when OAT is 0ºc or less in all conditions
Compressibility correction factor is always a (deduction, addition) to CAS?
Always a deduction, CAS correct for compressibility = EAS
TAS is ___ corrected for ____
EAS corrected for Density
The pictured is a typical pitot head (pitot-static) system.
What indicated at Label B?
Pitot (pitot tube) drain hole
The VSI uses a metering unit which places a restriction on flow in or out of the (instrument case, aneroid capsule) which is the correct answer?
Instrument Case
The pictured Turn Coordinator shows the aircraft making a (left,right, no turn) turn that is (balanced,slipping,skidding).
What combination is the correct answer?
**no turn (straight), skidding.
(too much left rudder being used and right wing slightly down, but no rate of turn)**
The VSI measures?
Rate of static pressure change
Define Gyroscopic Precession
Is the 90º displacement of an applied force into a tiliting force applied 90º further in the plane of rotation
The HI/DI requires between ___“Hg and ___“Hg for normal operation
between 3.5”Hg and 4.5”Hg for normal operation
Define Static Pressure
The prevailing pressure at any point in the atmosphere