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Huey > Limits > Flashcards

Limits Flashcards

1
Q

APU starter limits

A 
30 sec on
60 sec off
30 sec on
60 sec off
30 sec on
30 minutes off
No battery starts below -25 degrees F -32C
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2
Q

External Power Requirements

A

500 amps ave 300-1000 amps

28Vdc ave 23.9 - 29.1Vdc

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3
Q

Engine Starter limits less than 61 degrees F (16 degrees C)

A

First cycle - wait 60 seconds
Second cycle - wait 60 seconds
Third cycle - wait 60 seconds
Fourth cycle - wait 30 minutes

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4
Q

Engine starter limits 61 to 126 degrees F (16-52 degrees C)

A

First cycle - wait 60 seconds

Second cycle - wait 30 minutes

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5
Q

Hot start

A

Max MGT during start shall not exceed 867 degrees C

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6
Q

Engine start abort criteria

A
  1. Ng fails to reach 14 percent within 6 sec
  2. No MGT indication within 30 sec after the starter engages
  3. Oil pressure is not evident within 30 sec after starter is engaged. Do not motor engine if aborting due to lack of oil pressure.
  4. MGT reaches 867 degrees C before starter disengages
  5. starter fails to disengage above 55+-3 percent Ng
  6. Rotor brake light fails to extinguish within 30sec after rotor brake is released
  7. No Np within 30 seconds from Ng reaching idle of 67+- 3%
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7
Q

Max wind for rotor start stop

A

60 knots from any direction
Caution - inadvertent control system inputs and out of balance conditions may cause structural damage as the rotor decelerates through 65% Nr

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8
Q

Rotor brake limits

A

1&2. Do not apply rotor brake above 60% or below 25% Nr except in an emergency

  1. Release rotor brake prior to 0% Nr.
  2. During rotor brake start release rotor brake within 25 seconds after engine idle RPM 67+-3% Ng is attained
  3. During rotor brake start the light should go out within 30 seconds after the brake is released
  4. Do not exceed idle rpm with rotor brake engaged
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9
Q

Landing gear limits

A

Landing gear is permitted at maximum gross weight for all headings on slope surfaces up to and including six degrees.

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10
Q

Main rotor limits Power on

Greater than 30% torque

A

91% trainsient
97-104.9% continuous
104.9% Max

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11
Q

Main rotor limits power off

less than 30%

A

84% transient operation at 1 g
91-110.9% continuous
110.9% Max

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12
Q

Engine torque limits inner scale

A

0-65.7 continuous ops

65.7 Max

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13
Q

Main rotor gear box torque limits

A

0-104.9% continuous ops
105-110.9% transient ops 10 sec limit
6 transient over torques between 105-110.9 will require an inspection

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14
Q

Power turbine speed limits Np

A

99-101.7% cont ops
101.8-116.9% transient ops 12 sec limit
116.9% Max
55-70% avoid range

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15
Q

Measured gas temp limits

A

400-800 degrees C cont ops
801-867 intermediate ops 30 min limit
867 limit on start

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16
Q

Measured gas temp limit one engine inop

A

868-917 degrees C contingency power 2-1/2 min limit

917-964 transient ops 12 sec limit

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17
Q

Ng turbine speed limit

A

0-102.1% cont ops

  1. 1 - 105.1% transient ops 12 sec limit
  2. 2 maximum
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18
Q

Engine oil pressure limit

A 
20 psi min
20-30 psi caution range
30-100 psi cont ops
100 psi max
200 psi cold start max
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19
Q

Main rotor gear box oil temp limits

A

-50-0 degrees C caution range
0-100 degrees C normal
100-110 caution range
110 max

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20
Q

Main rotor gear box oil px limits

A 
25 psi - min
25 - 40 psi - caution range
40 - 70 psi - normal 
70 - 100 psi - caution range
100 psi  - max
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21
Q

combining gear box limits oil temp limits

A

-50-0 degrees C caution range
0-100 degrees C normal
100-110 caution range
110 max

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22
Q

Combining gear box oil pressure limit

A 
25 psi - min
25-70 psi - caution range
70-90 psi - normal 
90-150 psi - caution range
151 psi max
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23
Q

intermediate gear box oil temperature limits

A

-50-0 caution
0-124 degrees C normal range
124 - 129 degrees C caution range
129 degrees C max

24
Q

Tail rotor gear box oil temp limits

A

-50-0 degrees C caution range
0-100 degrees C normal
100-110 caution range
110 max

25
Q

Tail rotor gear box oil pressure limits

A

LO - min below 10 psi
GO - Normal 11-149 psi
HI - Caution range 150 - 174 psi
HI - max 175 psi

26
Q

Hydraulic temp limits

A

-7 deg C min
-7 - 10 deg C Caution range
10-110 deg C normal
110 - 115 caution
115 max

27
Q

Hydraulic pressure limits

A 
2000 psi - min
2001 - 2700 - caution range
2700 - 3150 - normal
3150 - 3850 - caution range
3850 max
28
Q

Hydraulic fluid level limits

A

LOW - 75 cubic in (min)
REFL - 75 - 85 cu in (caution)
FULL - 85 - 110 cu in

29
Q

Main generator voltage limits

A 
18 VDC - min
18 - 22 - caution range
22 - 29 - normal
29-30 caution range
30 max
30
Q

Main generator amp limits

A

0-400amps normal
400-600 caution
600 amps max

31
Q

Battery limits

A 
18 VDC - min
18 - 22 - caution range
22 - 29 - normal
29-30 caution range
30 max
32
Q

APU generator limits

A 
0-17.9 VDC - low
18 - 21.9 - Avoid range
22 - 29 normal
29.1 - 29.9 avoid range
30 volts high
33
Q

APU amperage limits

A

0-200 normal
200.1 - 299 avoid range
300-400 high

34
Q

essential and nonessential DC bus limits

A 
18 VDC - min
18 - 22 - caution range
22 - 29 - normal
29-30 caution range
30 max
35
Q

essential and nonessential AC bus limits

A 
104 VAC min
104 - 108 - caution range
108 - 118 normal
118 - 125 caution range
125 max
36
Q

Max airspeed

A

170 KIAS

37
Q

Max auto-rotational airspeed

A

120 KIAS

38
Q

Sideward and rearward flight airspeed

A

45 KIAS

39
Q

SCAS failure airspeed

A

100 KIAS

40
Q

Cabin doors opening/closing airspeed

A

80 KIAS

41
Q

Cabin doors open airspeed

A

170 KIAS

42
Q

Forward wing doors open airspeed

A

30 KIAS

43
Q

Prohibited maneuvers

A
  1. aerobatic maneuvers as defined by OPNAV
  2. practice autos to touchdown
  3. Practices auto entries from the shaded areas of the H-V diagram
  4. Dual throttle chops above 120 KIAS are prohibited
  5. Single engine throttle chops above 60% MRGB torque (may result in damage to the CBOX)
  6. Do not exceed 50% MRGB torque at airspeeds above Vh while in a dive
  7. Abrupt, simultaneous collective and cyclic inputs while maneuvering are prohibited (warning: may result in severe structural damage to the rotor system and result in loss of aircraft control) (Caution: abrupt movement of the cyclic away from the centered position while the aircraft is on the deck or settling to the deck may result in significant structural damage to the main rotor system)
44
Q

Weight and balance limits

A

Max gross weight of the helicopter including external load is 18,500lbs

45
Q

Cargo hook limits

A

max of 4000#

46
Q

External load limits

A

Airspeed max 130 KIAS

AOB limit 30 degrees

47
Q

Rescue hoist limit

A

The internal hoist weight limit is 600lbs. The retraction speed limit is 150 fpm at 600lbs or 300fpm at 300lbs. The usable cable length is 250ft

48
Q

Cargo Area

A

Located aft of avionics racks is 220 cubic feet of obstruction free cargo area
High density loading should be distributed over the deck area to maintain a loading of 100 pounds per ft^2.
For floor loading in excess of 100 pounds /ft^2 the load factor will be 350 divided by the floor loading in number of square feet

49
Q

Prohibited operations

A
  1. gravity fueling with engines or APR operating
  2. no flight shall be planned to terminate with less that 350# of fuel
  3. Except for emergencies, intentional in-flight operation with HYD 1 or 2 PBA selected to off is prohibited
50
Q

Ground handling limit

A

max jacking weight is 18,500#

51
Q

Icing limitations

A

Flight through icing conditions should be avoided

52
Q

Temperature limits

A

helicopter operation at outside air temps below -25 deg F (-32 deg C) or above 125 deg F (52 deg C) is prohibited. Temperature limits as a function of altitude is shown in figure 4-5

53
Q

Blade fold or spread limits

A

Blades should not be folded or spread in winds over 45 knots from any direction. If blade pin puller actuator motor stalls two consecutive cycles allow five minute cooling period prior to recycling the motor

54
Q

Aircrew limitations

A
  1. For normal troop seat configuration seating in the aft, outward configured port and starboard troop seats not authorized with doors closed
  2. Troop seat capacity is 241# (personel and equipment)
  3. Avoid placing metal objects, electrical conducting materials, or electronic gear with 400-mm (15.75-inch) magnetic zone of influence located around the magnetic head trackers and helmet receivers as depicted in figure 4-10
54
Q

Engine oil temperature limits

A

35-131 degrees c cont ops
132-149 degrees c 30 min ops
150 degrees c max

Huey (15 decks)

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