NATOPS Ch4 Limits Flashcards Preview

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Flashcards in NATOPS Ch4 Limits Deck (39)
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Whats required if you exceed a limit?

Appropriate entry shall be made on MAF--include what limit(s) were exceeded and include range, duration and any additional info that would aid mx personnel.


What should you do if you exceed a limit that XXX is indicated?


If a limited is exceeded to the extent that a red "XXX" is indicated, the crew SHALL LAND AS SOON AS PRACTICABLE


What is the Engine limited by?

Ng, Np, TGT, Oil Press, Oil Temp


Whats a start cycle and whats required between start attempts?

A start cycle defined as starter initiation, acceleration of output drive and starter dropout requires a 60 sec delay between start attempts any time a start is aborted except during emergencies


Engine Start Limitations

  1. Crossbleed starts: receiving eng shall be at or above 24% Ng prior to advancing PCL to IDLE.
  2. Engine start with main rotor blades or tail rotor pylong folded is prohibited.
  3. Start TGT limit is 851°C until idle speed attained.


Turbine Gas Temp (TGT)

0°-810° - Continuous

810°-851° - 30 Min 

851°-878° - 10 Min (as required; for Max Power and limiter checks only)

878°-903° - 2.5 min

903°-949° - 12 sec

949° - Max


Power Turbine Speed (Np)

Engagement Caution

<96% - Avoid

96-105% - Continuous (yellow above 101%)

105-117% - 20 sec

117-120% - 12 sec

120% - Max


During engagement, extended operations in the 20-40% and 60-75% ranges may cause engine damage


Main Rotor Speed (Nr)

<96% - Avoid

96-101% - Continuous

101-120% - Precautionary

120% - Max

>120% - 123%, Max for FCF only

127% - Overspeed Latch


Dual-Eng Torque (TRQ) below 80 KIAS

0-120% - Continuous

120-144% - 10 sec

144% - Max


Dual Engine Torque Limits apply when both engines are above 65% torque


Dual-Eng Torque (TRQ) above 80 KIAS

0-106% - Continuous 

106-127% - 10 Sec 

127% - Max


Dual Engine Torque Limits apply when both engines are above 65% torque


Single-Eng Torque (TRQ)

0-135% - Continuous

135-144% - 10 sec 

144% - Max


Gas Generator Speed (Ng) SysConfig 16

0-102.2% - Continuous

>102.2-106% - 2.5 min

106-107% - 12 sec

107% - Max 


What is the Transmission limted by?

What if it's in a precautionary range?

Nr, torque, oil press and oil temp

If oil press and/or temp are in precautionary range, the helo SHALL NOT be scheduled for additional flights until maintenance action is performed


Transmision Temp (XMSN T)

-50°-105°C - Continuous

105°-120°C - Precautionary 

120°C - Max


Transmission Press (XMSN P)

20psi - Min

20-30psi - Idle and transient

30-65psi - Continuous

(45-60psi in level flight)

65-130psi - Precautionary

130psi - Max


What are the notes regarding oil temperature limits?

During any operating condition no maintenance is required if transmission oil temp is the precautionary range for 5 min or less

Prolonged hovering in hot weather, 30°C (86°F) , may cause transmission oil temp to raise 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 is required


What are the notes regarding oil Pressure limits?

Following conditions do not constitute an emergency situation, but may be indicative of a degraded lubrication system. Any discrepancy SHALL be documented on a MAF.

  1. Steady press outside 45-60psi, but within normal limits of 30-65psi
  2. Fluctuations not to exceed a range of 10psi, within the normal limits 30-65psi

During transient pitch or steady-state nose-high pitch attitudes (autos, downwind hovering, rearward flight, slope-up landings, etc) xmsn oil press fluctuations (including momentary fluctuations below 30psi and transient drops below 20psi for up to one sec) are acceptable. Operating with press fluctuations below 30psi shall be limited to 30 min


Engine Oil Temp (ENG OIL T)

-50°-135°C - Continuous

135°-150°C - 30 min 

150°C - Max


Engine Oil Press (ENG OIL P)

22psi - Min

22-26psi - Precautionary

26-100psi - Continuous

100-120psi - Precautionary 

120psi - Max


Normal idle range is 22-55psi


What are the Starter limits for engine start?

What if you are motoring?

Start Cycles


Cycle 1 - 60 sec

Cycle 2 - 60 sec

Cycle 3 - 60 sec

Cycle 4 - 30 min


Cycle 1 - 60 sec

Cycle 2 - 30 min

Engine Motor (Ignition - OFF)

2 min - 5 min

2 min - 30 min


Times for motoring are cumulative within a 5-min period.


Min Fuel

On deck with no less than 600lbs


When is the APU allowed in flight?

APU is not intended for routine in-flight use. Operation of the APU shall be limited to essential operations only.

Acceptable in-flight use include emergency procedures, single-eng training, practice autos, and powering the ECS during extreme temps.


APU Operating Limitations

>43°C with eng and rotors operating - 30 min

<51°C with eng and rotors not operating - Continuous


Rotor Engagement/Disengagement

45 knots from any direction


  1. Max (Vne)
  2. Sideward/Rearward Flight
  3. Auto
  4. Boost Off
  5. 2 SAS Inop in IMC
  6. Either PRI SERVO PRESS caution
  7. Searchlight in fixed position other than stowed
  8. Searchlight in transition
  9. Dome at or above trail
  10. Dome below trail
  11. Cabin door opening/closing

  1. Max: 180 KIAS
  2. Side/Rear: 35 KIAS
  3. Auto: 100 KIAS
  4. Boost Off: 140 KIAS
  5. 2 SAS Inop IMC:  125 KIAS
  7. Searchlight Fixed: 160 KIAS
  8. Searchlight Transition: 100 KIAS
  9. At or Above: 70 KIAS, 45° AOB
  10. Below: 70 KIAS, 15° AOB
  11. Cabin Door Moving: 60 KIAS


With FLIR installed, failure to maintain balanced flight below 90 KIAS in descents over 1000fpm will result in inaccurate and erratic airspeed indications.


Rates of descent with a Rescue Hoist Load

Rate of descent limited to 1000fpm


Hovering Limitations

  1. Prolonged rearward flight and downwind hovering should be avoided to prevent accumulation of exhaust fumes in the helo and heat damage to the window of an open cabin door.
  2. Hovering turns at a rate in excess of 30° per second.
  3. Dipping operations at altitudes other than 70ft.
  4. Do not tow the transducer in the water above 8KGS with array folded and 4KGS with array unfolded


 Towing is defined as the cable contacting the funnel. Aircraft ground speed may be greater than 8KGS (folded) or 4KGS (unfolded) if cable is not in contact with the funnel.


Angle of Bank Limitations

  1. Normal ops: 45°
  2. Operations above 10,000ft DA: 30°
  3. Either PRI SERVO PRESS caution: 30°
  4. Boost off flight: 30°


Max Operating Altitude

Max operating DA is 13,000ft


Prohibited Maneuvers

  1. Aerobatic flight
  2. Practice full-autos landings
  3. Intentional approaches into or inducement of retreating blade stall.