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OCU > Limits > Flashcards

Limits Flashcards

1
Q

TRT
EGT , Time , N1, N2, Oil T, Oil P

A

870-905 C max, 5 mins
102% N1
105% N2
5-160 C (160-175C max 10 min)
11-92 psi

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2
Q

Min/ Max Cont
EGT , Time , N1, N2, Oil T, Oil P

A

610-870 C
102% N1
105% N2
-10 - 160C
11-92 psi

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3
Q

Flt Idle

EGT , Time , N1, N2, Oil T, Oil P

A

Min 390C (RAF RTS)
30-70% N1
71-84 N2
-10 - 160C
Min 11psi

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4
Q

Ground idle

A

-
16-22% N1
54-62% N2
-50 - 160C
Min 11 psi

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5
Q

Starting

A

-50 - 160 C
Positive indication oil pressure
Monitor fuel flow < 680pph
Up to 10s to light otherwise cutoff
725 max EGT

Cold wx (sub -23 C -10F) up to 60s to light with jet A1

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6
Q

Voltages (DC)

A

With ac online: >24-29v, charging +0-9A
Battery power >24v

JFS start: 22V JFS battery + 19 V main to start or single battery + 22V

Navigate to loads table; sec 3/emerg/systems/elec/non crit/D.C. loads - by function

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7
Q

Hydraulics
Gear door open
Gear up

A

2400-3050 L & R engines running (problem if it’s below 2800 though)
1300 (1 application) - 3050 brake accumulator
1: 3.75-4.25 gear down doors open, 4-5 doors closed, 3-4 gear up.

Preload: L/R 2000, Brake 1000

Rudder low: 2100-2400
Rudder high: 2800-3050

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8
Q

Only check cw tank on ground if above X fuel?

A

Do not test CWT pumps below 3,500 lbs

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9
Q

CG Limits

A

Above 280k check chart
Worst case 322,500 26% - 30%

RAF RTS: not aft of 30%
Not fwd of 23% landing
Not fwd 21% AAR

Below 275k 18% - 33%
Below 245k 16%(TO) 18%(land) - 33%

aim 25%, (cruise 32-33% efficiency)

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10
Q

Fuel quantities

A

Total Max: 166,153 lbs
9.97
2.9 / 14.1 / 15.2 / 48.7 / 15.2 / 14.1 / 2.9
42.7

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11
Q

AAR fuel filling limits

A

Reserves and Mains full = 322,500
Reserves full, mains depleted, no less than <1,500 = 299,000
Reserves empty, mains full = 293,000
Reserves and mains empty = 240,000

Aft tank < 39,450 lbs STRUCTURAL FAILURE
[TC] max 15,000lb fwd
Fwd tank max 10k, manually cut off or could over fill and burst bag.

UK: request reduce 50-25 psi when fwd or aft 80% 7.8 / 33.7, 90% stop filling 8.9/38.0

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12
Q

AC Voltage limits

A

200V 400Hz 3 Phase / 115V single phase
Caution: 180-190V 380-395 Hz
Norm: 190-210V 395-405 Hz
Caution: 210-220V 405-420 Hz

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13
Q

Max EGT on start (before coming to IDLE)

A

725 C

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14
Q

N2 Flight Idle

A

71-84%

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15
Q

N1 Flight Idle

A

30-70%

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16
Q

EGT limits

A

TRT or 870-905C - 5 mins
906-930C - retard to control temp until next landing
>930C - precautionary shutdown

17
Q

Engine over temp or speed

A

Airborne, Allowed to operate engine normally until next landing provided parameters are brought within limits. If maximum is exceeded, precautionary shutdown.

EGT 906-930C (retard)
N1 102.1- 105%
N2 105.1 - 106%

18
Q

Use of TRT wrt EGT limitations

A

5 min limit is both Thrust rating and EGT.
ie. If below 905C but operating at TRT, still limited to 5 mins!
TRT is only for take off, once airborne, MCT is the guide (no specified limit) and EGT/N1/N2 become controlling limits

19
Q

Rudder pressure after flaps are retracted

A

Low range: 2100-2400 psi
Flap actuated switch, Flaps < 5 down
High range: 2800-3050 psi
If stuck in high, speed below 230 KIAS check flap travel, CBs.

20
Q

Gear extension/retraction

Max IAS/Mach with gear extended

A

270 KIAS / M0.78 above 30,000ft

UK RTS 300kts below 30,500ft
M0.78 above 30,500ft

(320 KIAS / M0.85)

21
Q

Climb out, 30 Flap speeds:
15 AoB
30 AoB
F30-F20

A

Vco + 10
Vco + 20
Vco + 10

22
Q

Climb out, 20 Flap speeds:
15 AoB
30 AoB
F20 - clean

A

Vco + 10
Vco + 30
Vco + 25

23
Q

Cleaned up
15 AoB
30 AoB

A

Vco + 30 (clean up + 5)
Vco + 50

24
Q

Max Cont N1 and N2

A

N1 102% (absolute overspeed 105%)
N2 105% (absolute overspeed 106%)

25
Q

Engines at same N1
Normal EGT deviations?

A

40C
If greater, press engine monitor and flag to maintenance. Could be a sign of engine deterioration

26
Q

Clean
Below _____ lbs Vno / Mno
Above _____lbs Vno / Mno
Vne

A

<275klbs 330 KIAS / M0.8
>275klbs 300 KIAS / M0.8
Tanker join (all GW) 330 KIAS / M0.8
Vne 350 KIAS / M0.85

27
Q

Max GW with reserves and main tanks empty

A

240,000lbs

28
Q

Reserve tank transfer limitations

A

GW below 293,000 lbs (RTS)
Tanks 1 / 4 below 10,000lbs
Reserve + outboard main <= inboard main (DFM advised)

29
Q

Maximum zero fuel mass

A

195,000 lbs

30
Q

G limits
Clean, GW < ______ lbs
Clean, GW > ______ lbs
Flaps extended

A

Clean GW < 274,000 lbs +0.5 - 2G
Clean GW > 274,000 lbs 0 - 1.5 G
Flaps all GW +0.5 - 1.5G

31
Q

Practise 3 engine work max gross mass

A

225,000 lbs

31
Q
A

OCU (17 decks)

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