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CH-47 EP's & limits > System limits > Flashcards

System limits Flashcards

1
Q

Engine oil pressure limits

A

minimum pressure for NG at ground idle - 5 PSI
Minimum pressure for NG between 80% and 95% - 32 PSI
Minimum pressure for NG equal or greater than 95% - 50 PSI
Normal operation - 35 to 90 PSI
Maximum for contigency power - 110 PSI
Maximum for cold weather starts - 150 PSI

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2
Q

Engine oil temp limits

A

Maximum - 149*

ENG1(2) OIL HOT displayed over 149*

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3
Q

Engine transmission oil temp limits

A

Maximum - 140*

ENG1(2) XMSN warning appears at 190*

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4
Q

Transmission oil temp limits

A

Maximum - 140*

all 140*

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5
Q

Transmission oil pressure limits

A

Minimum at ground idle - 7 PSI
Minimum at 100% NR - 20 PSI
Normal operation - 20-90 PSI

red when trnsmission oil pressure is less than 7 PSI with NR equal to or greater than 25%
XMSN PRESS HI when greater than 90 PSI

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6
Q

Flight control hydraulic pressure

A

Low limit - 2500 PSI
Normal - 2500-3200 PSI
High limit - 3200 PSI

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7
Q

Hydraulic system temperature

A

Red/White max - 120*C
Yellow/White- 95*-120*C

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8
Q

Utility system hydraulic pressure

A

Low limit - 2500 PSI
Normal - 2500-3500 PSI
High limit - 3500 PSI

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9
Q

Rotor limitations

A

Minimum transient power-on - 91%
Transient - 91-97%
Normal - 97-101%
Transient - 101-106%
Max transient power-on - 106%
Maximum during autorotation - 108%
Maximum transient - 111%

No write-up required between 108-111.5% NR

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10
Q

Rotor limit colors

A

less than 91% - Red
91% to 97% - Yellow
97% to 101% - Green
101% to 106% - Yellow
above 106% - Red

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11
Q

Cruise guide indicator

A

Green - normal operation
Yellow - Transient
Red - Avoid
White - Test

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12
Q

How to reduce aerodynamic loading

A

a. Lowering thrust
b. reducing the severity of the maneuver
c. reducing airspeed

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13
Q

Starting and shutdown limits

A

APU shall not be started in tail winds in excess of 25 knots
Main engines shall not be started in tail winds in excess of 10 knots
aircraft should be oriented such that wind is coming in at the left side

land in a clear level area at least 300 feet from vertical obstructions

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14
Q

Power turbine inlet Temp limits

A

Max cont. - 816*C
Max for not more than 30 min - 854*C
Max for not more than 10 Min - 899*C
Max for not more than 2.5 min - 932*C
Max transient for not more than 12 sec - 943*C
Max transient for not more than 4 sec - >943*C

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15
Q

Power turbine inlet temp (PTIT) limit colors

A

PTIT equal or lower then 816*C - Green
PTIT between 816*C and 899*C - Yellow
PTIT between 899*C and 943*C - Red

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16
Q

Gas generator (NG) limits

A

Ground idle min. - 50%
Max - 111%

NG speed color
NG less than 50% - Yellow
NG 50 to 111% - Green
Ng above 111% - Red

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17
Q

Power turbine (NP) limits

A

Max trans. - 111.5%
NP limit colors
NP below 111.5% - Green
NP above 111.5% - Red

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18
Q

Engine torque (TQ) limits

A

Max dual engine - 100%
Max single engine - 123%

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19
Q

Fuel limits

A

Emergency fuel shall not be used for more than 6 hours

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20
Q

max gross weight

A

50,000 lbs.

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21
Q

Cargo hook limits

A

Fwd and aft hook: 17,000 lbs.
Center hook: 26,000 lbs.
Tandem from forward and aft: 25,000 lbs.

When combination of internal and external loads are carried and the external load exceeds 12,000 lbs, position internal load forward of the utility hatch.

22
Q

Winch/rescue hoist limits

A

rescue winch - 600 lbs
winch - 3,000 lbs straight line pull
6,000 lbs, one pulley
9,000 lbs, two pulleys
12,000 lbs, three pulleys

23
Q

airspeed limitations

A

max crosswind or sideward flight - 45 knots
max airspeed in rearward flight - 40 KCAS
Max airspeed with lower section of cabin entrance door open and locked - 60 KCAS
rescue hatch door will not be opened or closed above 90KCAS
windshield wipers will be off above 130 KCAS
do not close upper section of cabin entrance door above 100 KCAS
Left side escape hatch: do not installl or remove in forward flight

max tailwind for hover - 40 KCAS
VNE at negative density altitudes - 170 KCAS
VNE at positive density altitudes - 170 KTAS

24
Q

external cargo airspeed limits

A

if a sling or hook should fail while carrying a tandem load, limit airspeed to max of 60 KCAS

25
Q

DAFCS limits

A

single DAFCS - 100 KCAS
both DAFCS off - 160 KCAS or VNE whichever is slower (provided both were disabled below 100 KCAS)

26
Q

Aerobatics prohibition

A

Aerobatics are prohibited
+- 30* pitch and or 60* roll

27
Q

Bank limits

A

with operative CGI bank angles are limited by CGI, but no greater than 60*. When operating with BALT/RALT engaged, limit bank angles to 45* max.

28
Q

Landing limits

A

60 KGS = max ground speed for roll-on landings
20* = max nose-up attitude during landings
492 ft/min = max rate of descent at touchdown for grossweight 33,000 lbs and below
450 ft/min = max rate of descent at touchdown for grossweight from 33,000 lbs to 40,000 lbs
360 ft/min = max rate of descent at touchdown for grossweight above 40,000 lbs

29
Q

Ground operation limits

A

when thrust control lever is at ground detent:
right or left directional pedal - 0.75 inch
aft cyclic - 2.00 inches
lateral cyclic - 1.00 inch
thrust control lever - no lower than ground detent

when ground taxiing less than 75 feet from an obstruction at an unfamiliar airport (not designated for ch-47F heli’s) a blade walker/ taxi director will be present

30
Q

Flight under IMC limits

A

a. Both DAFCS are operational
b. standby flight displays (SFD) are operating
c. Three MFD’s (1,4 and either 2 or 3), two CDU’s, two GPPU’s, two DCU’s, two EGI’s and two ADC’s are operational
d. Coupled ILS approaches at localizer intercept angles of greater than 60* are prohibited (greater than 60* and the FD cue may continue to command a descent with a missed appr)

31
Q

shock abosrber vent valve

A

open for operation: below -18*C
Closed for operation: above -1*C
open or closed: -18* to -1*C

32
Q

Flight in icing conditions

A

a. EAPS is designed to permit safe flight in light-icing conditions
b. Continuous flight in light icing below +5*C is not recommended due to single blade damage from asymmetric ice shedding
c. intentional flight into known icing conditions with rotor blade erosion protection materials installed is prohibited
icing conditions include “trace”, “light”, “moderate”, and “heavy”

33
Q

Thunderstorm operations

A

a. To ensure lightning strike protection, lightning protection cables and straps must be installed and intact on all rotor blades
b. if any lightning cables or straps are missing or broken, avoid flight in or near thunderstorms, especially in areas of observed or anticipated lightning discharges

34
Q

operations with ski’s limits

A

max airspeed: 130 KCAS or VNE whichever is slower
Max allowable rate of descent at touchdown in snow is 480 ft/minup to 33,000 lbs. decreasing linearly to 240 ft/min at 46,000 lbs
max taxi speed when operating on hard prepared surfaces: 5 knots

35
Q

over water operation limits

A

day/night/nvg operations over water is permissable provided:

  • both DAFCS are operational
  • Pilot and copilot radar altimeter is operational
  • visible horizon is present at op site
  • helicopter drain plugs are installed
36
Q

Emergency water landing limits

A
  • restricted to 30 mins total floatation time
  • ramp and all doors closed during water landing
  • pitot heat turned off
  • searchlights retracted and off
  • DAFCS native modes must be disarmed
  • longitudinal cyclic trim actuators must be manually set to ground position
37
Q

APU operation in flight limits

A

prohibited except during emergencies

38
Q

Pitot tube and windshield heat limitations

A

Pitot heat switch shall not be on for more than 5 minutes on the ground
Windshield heat shall not be used above 24*C

39
Q

Single point refueling limit

A

Max rate for pressure refueling - 300 gal/min at 55 PSI

40
Q

Extended range fuel system (ERFS) limits

A

ERFS II max capacity when gravity refueled - 825.5 US gallons
ERFS II usable fuel when single port pressure refueled - 800 US gallons
RSERFS max capacity when gravity refueled - 516 US gallons
RSERFS usable fuel when single point pressure refueled - 500 US gallons
max internal pressure of ERFS/RSERFS tank should not exceed 5 PSI
maximum allowable suction defueling pressure - (-11) PSI

41
Q

VNE

A

170 KCAS

42
Q

No. 1(2) HYD FLT CONTR caution

A

less than 1800 PSI

43
Q

Power limits caution - 30 Min power available below which speed during arrival and departure

A

40 KCAS

44
Q

Contingency power

A

up to 932 PTIT for as many occurences as needed as long as each occurence is less than 2m30s. Transient power 932 - 943 PTIT is not to be greater than 12 seconds.

45
Q

Engine overspeed

A

An engine overspeed exists when NG is greater than 111%

46
Q

LCT actuator limits

A

Do not manually extend LCT beyond GND position below 60 KCAS

47
Q

Inoperative CGI limit

A

Flight equal to or less than 98%NR with an inop CGI is prohibited

48
Q

Wind direction in chart A for starting and shut down

A

015* to 125*

49
Q

Buffer for the ENG1(2) advisory (advisory regards temp)

A

5* window from 927* to 932*

50
Q

ENG 1(2) TEMP HI (CAUTION)

A

When PTIT of 932* has been exceeded

51
Q

When may a dual FADEC failure occur?

A

When rearward flight or tailwind exceeds 40 kcas

CH-47 EP's & limits (2 decks)

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