Mnemonics and Main Memory Items | Instruments Flashcards

1
Q

The mnemonic to remember blockages effects while climbing and descending for the ASI?

A

CPO = Climbing - Pitot(blocked) - Over-read

CSU = Climbing - Static(blocked) - Under-read

DPU - Descending - Pitot(blocked) - under-read

DSO - Descending - Static - Over-read

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2
Q

What does the blue line on a multi-engined ASI represent?

A

Vyse, the best rate of climb with one engine inoperative

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3
Q

How to remember AH pitch and roll limitations:

A

East/west the earth rolls = roll limited

North/south is like pitch axis = Pitch limited

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4
Q

AH:

Pendulous Acceleration will show -

Pendulous Deceleration will show -

Erection Error during acceleration will show -

Erection error during deceleration will show -

How to remember:

A

Pendulous Acceleration will show - False right bank

Pendulous Deceleration will show - false left bank

Erection Error during acceleration will show - false pitch up

Erection error during deceleration will show - false pitch down

Acceleration normally an aircraft will pitch up, and pitch down during deceleration. Acceleration is right.

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5
Q

AH turning errors:

Turning through 90°:

Turning through 180°:

Turning through 270°:

Turning through 360°:

One way to remember -

A

Turning through 90°: Under reads bank angle; Pitch error – indicating a climb

Turning through 180°: Bank angle correct; Pitch error – indicating a climb (maximum pitch up error)

Turning through 270°: Over reads bank angle; Pitch error – indicating a climb

Turning through 360°: Bank angle correct; Pitch correct

90 is lower than 270, thus 270 show excess bank and 90 under bank.

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6
Q

Formula for turn radius:

A

m/s^2 / 10 x tan bank angle.

m/s = 0.5 x knots.

Diameter = radius x 2

Circumference = diameter x 3.14

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7
Q

Air-driven AH gyro: kept in the vertical by

Electrical AH gyro: kept in the vertical

A

pendulous vanes/air jets

two mercury switches sending signals to torque motors

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8
Q

Formula for apparent drift:

A

15 x sine of the latitude

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9
Q

NH: Drift is to the

SH: Drift is to the =

A

right = clockwise (-)

left anti-clockwise (+)

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10
Q

For the DI or DG to measure change of heading during a banked turn, the gyro must be maintained in

A

The aircraft’s vertical and not the true vertical

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11
Q

Remembering gyro magnetic compass process:

A

FEAT

Flux - Error detector - Amplifier - Torque motor

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12
Q

Remembering gyro magnetic compass process:

A

FEAT

Flux - Error detector - Amplifier - Torque motor

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13
Q

Relevant to altimeter:

Using static alternate inside cabin will indicate -

A

Climb. Cabin pressure in an unpressurized aircraft is lower

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14
Q

The altimeter indicates true altitude:

A

A

in standard atmosphere only

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15
Q

Mach number =

Thus TAS(relevant to MN) =

LSS is directly proportional to -

using this knowledge, if OAT increases when at a constant TAS:

Or just use to CX2!

A

TAS/LSS

MN x LSS

Temperature.

Mach number decreases

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16
Q

LSS reduce with -

A

Temperature

17
Q

Full Scale Deflection:

  • Full scale deflection in RNAV ENR Mode =
  • Full scale deflection in RNAV APP Mode =
  • Full scale deflection for a VOR =
  • Full scale deflection for a LLZ =
  • Full scale deflection for a G/S =
A

Full Scale Deflection:

  • Full scale deflection in RNAV ENR Mode = 5 NM
  • Full scale deflection in RNAV APP Mode = 1.25 NM
  • Full scale deflection for a VOR = 10°
  • Full scale deflection for a LLZ = 2.5°
  • Full scale deflection for a G/S = 0.7°

2-dot EFIS display:

  • one dot in RNAV ENR = 2.5 NM (some questions only have 2NM as an option, but if 2.5NM is available, select 2.5NM)
  • one dot in RNAV APP = 0.625 NM
  • one dot in VOR = 5°
  • one dot in ILS = 1.25° (LLZ)

5-dot EFIS display:

  • one dot is 1 NM in RNAV ENR (full scale = 5 dots = 5 NM)
  • one dot is 0.25 NM in RNAV APP (full scale = 5 dots = 1.25NM)
  • one dot is 2° in VOR
  • one dot is 0.5° in ILS (LLZ)
18
Q

A leak in the pitot total pressure line of a non-pressurized aircraft to an airspeed indicator would cause it to:

A

under-read.

The mnemonic CPO CUS DPU DPO only applies to blocked line(static or dynamic)

19
Q

When an alternate static source is fed from within the cabin, it results in the static pressure sensed being:

A

lower than ambient due to aerodynamic suction

20
Q

When the alternate static source pressure is used, vented in the cabin(lower pressure), the following instrument indications are observed:

  1. The altimeter indicates -
  2. The ASI indicates an airspeed -
  3. The VSI shows a momentary -
A
  1. The altimeter indicates a slightly higher altitude than actual
  2. The ASI indicates an airspeed greater than the actual airspeed
  3. The VSI shows a momentary climb and then stabilizes if the altitude is held constant
21
Q

Mnemonic to remeber IAS, CAS, EAS and TAS relationship -

A

ICET PCD.

IAS + Position/instrument error = CAS

CAS + Compressibility error = EAS

EAS + density error = TAS

22
Q

In a standard atmosphere and at the sea level, the equivalent airspeed (EAS) is(relevant to TAS):

A

equal to the TAS

23
Q

During a descent at a constant calibrated airspeed (CAS) below the tropopause in ISA conditions, what happens to the TAS, MN, LSS and EAS respectively:

During a descent at a constant Mach number below the tropopause in ISA conditions, what happens to IAS and TAS respectively:

A

TAS decrease, MN decrease and speed of sound increase and EAS increase

TAS increase and IAS increase

24
Q

The indicated Mach number is independent of:

A

temperature

25
Relevant to mach number: TAS =
MN x LSS
26
Mach number is independent of - LSS is directly proportional to -
temperature Temperature
27
Considering an airspeed indicator, a second striped needle, if installed, indicates: The velocity maximum operating (VMO) is a speed expressed in:
VMO | CAS or EAS
28
At a given altitude, the hysteresis error of an altimeter varies substantially with the:
time passed at this altitude
29
A compass made for the NH, the CG will be located -
On the southern side of the needle. For SH the opposite applies
30
The direct reading magnetic compass is made aperiodic (dead beat) by:
keeping the magnetic assembly mass close to the compass point and by using damping wires
31
Magnetic compass turning error mnemonic: North - South -
UNOS for north ONUS for South. UNOS is north because the first letter is "up", NH is up from SH
32
At the magnetic equator, when accelerating after take off on heading West, a direct reading pivot suspended compass:
indicates the correct heading