Limits Flashcards
Engines are limited by what 5 things?
Ng
Np
TGT
Oil px
Oil temp
Starter cycle is defined by?
Initiation
Acceleration
Dropout
TGT
0-810, continuous, green
810-851, 30 min, yellow
851-878, 2.5 min(10 min for max pwr/limiter checks), red
878-903, 2.5 min, red
903-949, 12 seconds, red
949, max, red
Np
<96%, avoid, red
96% - 105%, continuous, green (yellow above 101%)
105% - 117%, 20 sec, yellow
117% - 120%, 12 sec, yellow
120% max, red
During engagement, Avoid 20-40% and 60-75%
Nr
<96%, avoid, red
96-101%, continuous, green
101-120%, precautionary, yellow
120, max, red
123% max for FCF only
127% overspeed latch
Dual engine TQ <80kias
0-120%, continuous, green
120-144%, 10 seconds, yellow
144%, max, red
Dual engine TQ > 80kias
+ note
0-106%, continuous, green
106-127%, 10 seconds, yellow
127%, max, red
Dual engine TQ limits apply when both engines are above 65%
Single Eng TQ
0-135%, continuous, green
135%-144%, 10 seconds, red
144%, max, red
Ng
0-102.2%, continuous, green
102.2%-106%, 2.5 minutes, yellow
106-107%, 12 seconds, red
Max 107%
Transmission temp
-50-105 C, continuous, green
105-120 C, precautionary, yellow
120 C max red
During any operating condition, no MX action is required if the main transmission oil temperature is in the precautionary range for 5 mins or less.
Prolonged hovering in hot weather, (30 C), may cause main transmission to rise into the precautionary range. Operation in the precautionary range for less than 30 min during any one flight under this condition is acceptable and no maintenance action is required.
Transmission Px
20 psi, minimum, red
20-30 psi, idle & transient, yellow
30-65 psi (45-60 psi in lvl flight), continuous, green
65-130 psi, precautionary, yellow
130 psi max
During steady-state level pitch attitudes, the transmission oil pressure should be 45-60 psi. The following conditions do not constitute an emergency situation but may be indicative of a degrade lubrication system. Any discrepancy shall be documented on a MAF:
- Steady pressure outside 45-60, inside 30-65
- Fluctuations not to exceed a range of 10 psi within 30-65
During transient pitch or steady state nose high pitch attitudes, transmission oil pressure fluctuations (including momentary fluctuations below 30 psi and transient droops below 20 psi for up to 1 second) are acceptable. Operating with pressure fluctuations below 30 psi shall be limited to 30 minutes.
Engine Oil Temp
-50 to 135 C, continuous, green
135 to 150 C, 30 min, yellow
150 C max
Engine Oil Px
1 note
22 psi, minimum, red
22-26 psi, precautionary, yellow
26-100 psi, continuous, green
100-120 psi, precautionary, yellow
120 max
Idle range is 22-55 psi
Eng Starter Limits
<16 C
16-52 C
Engine Motor (ignition OFF)
<16 C
First 3 cycles -60 seconds
4th cycle- 30 minutes
16-52 C
1 cycle- 60 seconds
2nd cycle- 30 minutes
Motoring
2 min ON- 5 min OFF
2 min ON- 30 min OFF
(Times are cumulative within 5 minutes)
Min planned fuel on landing
600 lbs
Acceptable APU use includes:
Not intended for routine inflight use. Operation of the APU in flight shall be limited to essential operations only:
EP’s,
Single engine training
Practice auto rotations
Powering ECS during extreme temperature operations
Transmission limited by
Nr
Torque
Oil pressure
Oil temperature
ENGINE TQs over 150% are displayed as
Red XXX
Hovering limits
- Prolonged rearward flight and downwind landing should be avoided to prevent accumulation of exhaust fumes in the helicopter and heat damage to the window of an open cabin door.
- Hovering turns in excess of 30 DPS
- Dipping sonar operations at altitudes other than 70 ft
Caution: deviation of aircraft hover altitude from 70 ft while the transducer assembly enters or exits the water may result in damage to the dipping sonar due to electrostatic discharge.
- Do not tow the transducer in the water above 8 KGS with the transducer folded and 4 KGS with array unfolded.
Caution: exceeding tow limits may cause TA separation.
Note: towing is defined as the cable touching the funnel.
Airspeeds:
Vne -180 kias Max as limited be blade stall Sideward/rearward- 35 knots Autorotation- 100 kias Boost off- 140 kias 2 SAS in IMC- 125 kias PRI SERVO PRESS- 125 Search light other than stowed- 160 kias Search light transition- 100 kias Cabin door opening or closing- 60 kias Dome at or above trail (cable extended 10 ft, dome approx 6 ft below a/c) - 70 kias, 45* Dome below trail - 70 kias, 15*
AOB limits
Above 10000 ft DA -30
Either PRI Servo light- 30
Boost off flight- 30
Rotor brake limits?
Max 76%
30-50% for regular stops
180 psi
Max touchdown speed
75 KGS w/ locked tailwheel
20kgs w/ unlocked tailwheel
Max taxi speed?
40 KGS with shimmy dampener
20 KGS without shimmy dampener
Slope limits?
6 nose down
9 nose up
12 cross slope
Rate of descent for a/c landing above 19500 lbs? Below?
Sloped terrain?
480 fpm
720 fpm
360 fpm
APU operating limits?
Either eng and rotor operating
- 30 min with a temp of 43 C and above
Eng and rotor not operating
- APU and eng continuously operating up to 51 C
Transmission Oil pressure limitations
Shall me documented on a MAF:
During Transient Pitch or steady-state nose-high attitudes:
- Steady pressure outside 45-60 psi but within the normal limits of 30-65 psi
- Fluctuations not to exceed a range of 10 psi, within the normal limits of 30-65 psi
- Transmission oil pressure fluctuations (including momentary fluctuations below 30 psi and transient drops below 20 psi for up to one second) are acceptable.
- Operating with pressure fluctuations below 30 psi shall be limited to 30 min
Prohibited Maneuvers
- Aerobatic flight
- Practice full-autorotation landings
- Intentional approaches into or inducement of retreating blade stall
Icing Conditions
- Helicopters equipped with operable anti-ice and blade deice equipment are permitted flight into forecast or known trace or light icing conditions
- all installed anti-ice/deice equipment shall be operational prior to flight.
- Helicopters not equipped with operable blade deice equipment are prohibited from flight into forecast or known icing conditions (ambient temps of 5*C or below in visible moisture)
- Flight into forecast or known moderate or severe icing conditions is prohibited
Altitude limits
13000 DA
Blade pylon and stab fold and spread limits
Max wind velocity any direction - 45 kts
Following a complete fold/spread cycle allow 10 minutes for cooling before starting another.
Defined as a full spread evolution immediately followed by a full fold evolution.
Landing limits
Max rate of decent:
> 19500
<19500
Slope
Max touchdown speed
Max taxi speed
Max slope landing angle
Downswing landings should be avoided
Windows
Shall not be installed or removed in flight, except during actual aircraft emergencies
External load weight limits
Cargo hook - 6000
Rescue hoist - 600
Min equipment for night flight over water
LAWS
Altitude Hold(RAD ALT or BAR ALT)
Min equipment for passengers
Except in emergencies, ADHEELS and IHEELS shall be operational for all over water flight
Back up hyd pump limits
Rotor system static, to prevent hydraulic fluid overheating
33-38: 24 on 72 off
39-60: 16 on 48 off
Temp limits
Temps below -40C or above 60C are prohibited
Gross Weight Limits
Max - 23,500 lbs
Aviation ships - 23,500 lbs
air-capable ships/amphibious assault aviation ships - 22,500 lbs
Engine start Limitations
- Single and dual engine start limits listed in in figure 4-3. For crossbleed starts, the receiving engine shall be at or above 24% Ng prior to advancing the PCL to IDLE.
- Engine starts with the main rotor blades or tail pylon folded is prohibited.
- The start TGT limit is 851 until idle speed is attained.