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Delta Interview Prep > Formulas > Flashcards

Formulas Flashcards

1
Q

What is the 60:1 rule?

A 
1° = 1NM @ 60NM
1° = 100' @ 1NM
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2
Q

Climb Gradient

A

Gradient = altitude to lose / distance

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3
Q

Pitch change for a gradient

A

Pitch change° = gradient / 100

100’/NM is 1° pitch change

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4
Q

VVI

A 
VVI = gradient * TAS in min
VVI = pitch° * 100 * TAS in min
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5
Q

VVI for 3° & VVI for 2.5°

A

VVI 3° = GS * 5

VVI 2.5 = GS * 5 - 100

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6
Q

Distance to descend

A

Distance = Alt loss in 1ks / 3

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7
Q

TAS from IMN

A

TAS = IMN * 600

approximation

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8
Q

TAS from IAS

A

TAS = IAS + FL/2
TAS = IAS + 5kt / 1000’
above are same answer

TAS = IAS + 2% per 1000’
best formula

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9
Q

Density Altitude Variation from Temperature

A

Density Alt = Pressure Alt +/- 1000’ per 15°F or 8°C
OR
120’ per 1°C

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10
Q

NM/Min from TAS or IMN

A 
NM/MIN = TAS/60
NM/MIN = IMN * 10
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11
Q

Pitch change from wind

A

60kts wind is approximately 1° pitch change

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12
Q

Turn Radius (TR) at 30° Bank

A 
TR = NM/MIN -2
TR = (NM/MIN)^2 / 10
TR = IMN * 10 - 2
TR = IMN^2 * 10
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13
Q

Turn Radius (TR) of Standard Rate Turn (SRT)

A

TR of SRT = 0.5% of TAS

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14
Q

Standard Rate Turn (SRT) bank°

1/2 SRT bank°

A

SRT Bank = TAS / 10 + 7
SRT Bank = 15% of TAS
1/2 SRT = TAS / 20 + 7

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15
Q

90° Lead point for DME Arc

A

DME Lead = Arc radius +/- Turn Radius

Radial Lead = 60*TR/Arc Radius

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16
Q

Multipliers for other than 90° turns for arcs

A 
30° = 1/6
45° = 1/3
60° = 1/2
90° = 1
120° = 1 1/2
135° = 1 2/3
150° = 1 5/6
180° = 2
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17
Q

Bank° to maintain DME arc

A

Bank° = 30*TR/Arc radius

Use IMN^2 * 10 for best results

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18
Q

Teardrop offset with 30° bank

A

Offset = 120*TR/outbound distance

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19
Q

Teardrop outbound distance

A

Distance = 120*TR/offset

20
Q

Teardrop Bank° when unable 30°

A

Bank° = 60*TR/distance between radials

21
Q

Distance between radials

A

Distance = Degrees * NM / 60

22
Q

Holding Altitudes, Airspeeds and Leg Times

A

0-6,000 200 KIAS 1 min
6,001-14,000 230 KIAS 1 min
14,001+ 265 KIAS 1.5 min

23
Q

Outbound holding time correction

A

1+00: outbound = 3600/inbound

1+30: outbound = 8100/inbound

24
Q

Drift° from TAS, IMN and portion of max drift

A 
Drift° = x-wind/TAS in min
Drift° = x-wind * 10 / IMN out of 100

Use seconds on clock to calculate portion of max, 20° = 1/3, 30° = 1/2, 60° = 1

25
Q

Time to turn 180° at 30° bank

A

180° in minutes at 30° bank = 0.5% of TAS

26
Q

Double Drift Holding Procedure

A

Bank angle into wind = 30° - drift°
Other turn = 30° bank
inbound leg = course +/- drift
outbound leg = course +/- 2 * drift

27
Q

Triple Drift Holding Procedure

A

Both turns = 30° bank
inbound leg = course +/- drift
outbound leg = course +/- 3 * drift

28
Q

Procedure turn distance for 45/180 and 80/260

A 
45/180 = 3 * TR + 2
80/260 = 3 * TR
29
Q

Course Intercept heading

A

(Radial on - Desired Radial) * 2
no less than 20
no more than 90

30
Q

VDP Calculations

A

VDP in NM = HAT/gradient (normally 300)
VDP in sec from runway = HAT / 10

sec/mi = time from box/nm from FAF to MAP
sec/mi = 3600/TAS
VDP Time = sec/mi * FAF-VDP distance

31
Q

Timing for correct circling distance

A

These times generate a 2*TR distance from runway

To correct TAS, add Headwind and subtract tailwind

90° time = 10% corrected TAS
30° time = 10% corrected TAS * 4
45° = travel 2*TR down runway

32
Q

Time and Distance from station

A

Time from station = seconds/bearing change

Distance from station = TAS*min/bearing change

33
Q

Speed of sound formula and temperature approximation

A

39*SQRT(Temp°C + 273)

Varies 1.2 Kts per 1°C

34
Q

Hydroplaning Formulas

A 
Takeoff = 8.6*SQRT(tire pressure)
Landing = 7.7*SQRT(tire pressure)

online approximations are 9*sqrt(tire pressure)

35
Q

Specific Range, Endurance and Fuel Consumption

A

Specific Range = Distance/Fuel OR Speed/Fuel Flow
Specific Endurance = Flight Hours/Fuel OR 1 / Fuel Flow
Specific Fuel Consumption = Fuel Flow/Thrust

36
Q

ATC Light Gun Signals on the Ground

A

Steady Green = Cleared for Takeoff
Flashing Green = Cleared to Taxi
Steady Red = Stop
Flashing Red = Taxi clear of runway
Flashing White = Return to Starting Point
Alternating Red and Green = Exercise Extreme Caution

37
Q

ATC Light Gun Signals in the Air

A

Steady Green = Cleared to Land
Flashing Green = Return for Landing
Steady Red = Give Way and Continue Circling
Flashing Red = Airport Unsafe, do not land
Flashing White = N/A
Alternating Red and Green = Exercise Extreme Caution

38
Q

Approach Categories and Old Standard Circling Minimums

A 
Cat A 0-90 1.3
Cat B 91-120 1.5
Cat C 121-140 1.7
Cat D 141-165 2.3
Cat E 166+ 4.5
39
Q

New Circling Minimum for Cat C

A 
MDA
 < 1000 2.7
1001-3000 2.8
3001-5000 2.9
5001-7000 3.0
7001-9000 3.2
9001+ 3.3
40
Q

Fuel Minimums

A

Domestic: Destination + Furthest Alternate + 45 min
Flag: Destination + Furthest Alternate + 30 + (Destination + Alt * 10% or 90 min, whichever is less)

41
Q

Destination WX Alternate requirements

A

Domestic: +/- 1 hour, 2000, 3 miles vis

Flag +/- 1 hour, MDA + 1500 or 2000 (greater), vis+2 or 3 (greater); always if over 6 hours

42
Q

Standard Takeoff Mins

A

1 or 2 engine = 1 mile

3 or 4 engine = 1/2 mile

43
Q

Takeoff/Landing Performance as a result of Weight, Density Alt, Temperature, Wind, and Humidity

A 
10% weight = 20% T/O, 10% LND
1000' density = 10% T/O, 4% LND
10°C = 10% T/O, 5% LND
10% wind of Vref/Vr = 20% distance
High Humidity = 10% T/O
44
Q

True Altitude from temperature

A

Hot to cold look out below
4’/1000’/1°C
subtract cold; add hot

45
Q

Radar Tilt

A

Distance * Tilt° * 100 = relative height of storm

Delta Interview Prep (4 decks)

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