Blackhawk limits

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  1. Rotor start and stop limits
    5.6.1 Rotor Start and Stop limits. Maximum wind velicity for rotor start or stop is 45 knots from and direction.
  2. Main rotor overspeed limitations
    • 127%
    • 137%
    • 142%
  3. Engine % RPM
    • Avoid operations
    • 20%-40% and 60% to 90%

    • Transient 91% - 95%
    • Continuous 95% - 101%
    • Transient 101% - 105%
    • 12 Sec Trans 105% - 107%
  4. Main rotor % RPM
    • Power ON
    • Transient 101% - 107%
    • Continuous 95% - 101%
    • Transient 91% - 95%

    • Power OFF (AUTO)
    • Max 110%
    • Trans 105% - 110%
    • Norm 90% - 105%
  5. Fuel Quantity
    • normal 200 - 1500 lbs
    • precautionary 0 - 200 lbs
  6. max airspeed
    maximum 193 knots
  7. ENGINE Ng
    • 12 sec trans 102% - 105%
    • 30 min limit 99% - 102%
    • Continuous 0 - 99%
  8. ENG OIL TEMPERATURE
    • 30 MIN LIMIT 135 - 150° Cel
    • Continuous -50 - 135°
  9. ENG OIL PRESSURE
    • 5 min limit 100 - 120 PSI
    • Normal 26 - 100 PSI
    • Idle 22 - 26 PSI
  10. ENG % TRQ (L)
    • 10 Sec Trans
    • Dual-ENG
    • Above 80 KIAS 100%-144%
    • 80 KIAS or Below 120%-144%

    Single-ENG 135%- 144%

    Continuous

    • Dual-ENG
    • Above 80 KIAS 0%-100%
    • 80 KIAS or below 0%-120%

    Single-ENG 0%-135%
  11. ENG % TRQ (A)
    • 10 Sec Trans
    • Dual-ENG  100 - 125%
    • Single-ENG  110 - 135%
    • Continuous Single-ENG 0-110%
    • Continuous Dual-ENG 0-100%
  12. TGT
    • 12 sec trans 903-949°
    • 2.5 min trans 878-903°
    • start abort 851°
    • 10 min limit 851-878°
    • 30 min limit 810-851°
    • normal 0-810°
  13. Main Transmission Oil Temp (L)
    • Precatuionary 105 - 140°
    • Continuous -50 - 105°
  14. Main Transmission Oil Temp (A)
    • Precautionary  105 - 120°
    • Continuous     -50 - 105°
  15. Main Trans Oil Pressure (L)
    • Precautionary 65 - 130 PSI
    • Continuous 30 - 65 PSI
    • Idle and Trans 20-30 PSI
  16. Main Trans Oil Pressure (A)
    • Precautionary  65 - 130 PSI
    • Continuous      30 - 65 PSI
    • Idle and Transient  20 - 30 PSI
  17. Main Trans Oil Pressure
    (Fluctuations)
    • Oil pressure should remain between 45 and 60 PSI
    • Make entry if steady under 45 PSI or suddon pressure drop (more than 10 PSI)
  18. ENG Starter Limits
    15 deg and below -- 2 cons start cycles then 3 min rest then 2 additional start cycles then 30 min rest (60 sec between starts)

    above 15 deg -- 2 cons starts then 30 min rest
  19. Pneumatic Source Inlet Limits
    The minimum ground-air source (pneumatic) required to start the helicopter engines is 40 psig and 30 ppm at 149°. The maximum ground-air source to be applied to the helicopter is 50 psig at 249°, measured at the external air connector on the fuselage.
  20. ENG Start Limits
    CAUTION - ENG start attempts at or above a pressure alt of 18,000 ft could result in a Hot Start.

    Crossbleed start shall not be attempted unless the ENG ANTI-ICE ON advisory does not appear, and op ENG must be at 90% Ng or above and rotor speed at 100% RPM R. SE starts above 14,000 ft, press start switch with the EPCL lever OFF, until max motoring speed (about 24%), before going to IDLE.
  21. Fuel Limitations
    Fuel boost pumps shall be off except as required by emergency procedures and the following: boost pumps ON when operating w/ JP4 or equivalent at 5000 ft PA and above and when operating in crossfeed w/ JP4 at any altitude.

    CAUTION-- When converting from JP4 to JP5/JP8, three helicopterr refueling ops must be completed before performing ops with fuel boost pumps off.

    When a helicopter ops with JP4 is restarted w/n 2 hours of ENG shutdown and the FAT is above 21 deg, a minimum of 2 min of dual ENG ground ops at 100% RPM R is required prior to takeoff to purpge possible hot fuel from ENG nacelle area.
  22. Max gross weight (A)
    • Wedge mounted pitot static probes.
    • 22,000 lbs
  23. Max gross weight (L)
    22,000 lbs
  24. UH 60(L) max weight external lift mission
    23,500 lbs

    External lift missions above 22,000 pounds can only be flown with cargo hook loads above 8,000 pounds and up to 9,000 pounds.
  25. 7 lug wheel max weight
    Ground ops with seven-lug wheels are limited to gross weights less than 20,500 pounds.
  26. Storage compartment max weight
    125 pounds
  27. cabin ceiling tiedown fittings capability
    The four cabin ceiling tiedown fittings have a limited load capability of 4000 pounds
  28. Rescue Hoist Weight Limitation
    The maximum weight that may be suspended from the rescue hoist is 600 pounds.
  29. Cargo hook weight limitation
    UH60(A) - 8,000 pounds

    UH60(L) - 9,000 pounds
  30. Max Airspeed with external loads
    140
  31. Max airspeed with ext load greater than 8000 pounds and gross weight greater than 22,000 pounds
    shall not exceed 120 KIAS
  32. Max Airspeed with one ENG inop
    Max speed for one ENG inop is 130 KIAS
  33. Max airspeed for auto if GW 16,825 LBS or less
    150 KIAS
  34. Max airspeed for auto if GW greater than16,825
    130 KIAS
  35. Airspeed for sideward/rearward flight
    Hovering in winds greater than 45 knots from the sides or rear is prohibited. Sideward/rearward flight into the wind, when combined with windspeed, shall not exceed 45 knots.
  36. SAS INOPT Airspeed limits
    • One SAS inopt - 170 KIAS
    • Two SAS inopt - 150 KIAS
    • Two SAS inopt in IMC - 140 KIAS
  37. Hydraulic inopt airspeed limits
    • One HYD SYS inopt - 170 KIAS
    • Two HYD SYS inopt - 150 KIAS
    • Two HYD SYS inopt in IMC - 140 KIAS
  38. Airspeed limits - Searchlight
    Searchlight must be extended prior to reaching 100 KIAS and can be left extended up to 180 KIAS.
  39. Airspeed limits - Landing Light
    Landing light must be extended prior to reaching 130 KIAS and can be left extended up to 180 KIAS.
  40. Airspeed limits : Flightwith cabin door(s)/Window(s) open
    • -Cabin doors may be open to 100 KIAS with soundproofing installed aft of station 379.
    • -Cabin doors may be open to 145 KIAS with soundproofing removed or properly secured.
    • -Cabin doors not open or close during flight. May open or close during hover.
    • -Gunner's window may be fully open up to 170 KIAS
  41. Airspeed limits: Failure of Automatic Stabilator
    • 1-Stab set full down at speeds below 40 KIAS.
    • 2-Stab set at 0 deg at speeds above 40 KIAS.
    • 3-Auto airspeed shall be limited to 120 KIAS at all gross weights.
    • 4-Manual control not available. The placard airspeed limits shall be observed as not-to-exceed speed (powereed flight and auto), except in no case shall the auto limit exceed 120 KIAS.
  42. Prohibited Maneuvers
    • a.Hovering turns greater than 30° per sec are prohibited. Intentional maneuvers beyond attitudes of +/-30° in pitch or over 60° in roll are prohibited.
    • b. Simultaneous moving of both EPCLs to IDLE or OFF (throttle chop) in flight is prohibited.
    • c. Rearward ground taxi is prohibited.
  43. Restricted Maneuvers:
    -Manual opof the STAB
    -Downward hovering
    • -Manual op of STAB is prohibited except for formal training, maintenance test flight, or in case the AUTO mode malfunctions.
    • -Prolonged rearward flight and downwind hovering are to be avoided to prevent accumulation of exhaust fumes in the helicopter and heat damage to windows on open cargo doors.
  44. Blade stall:
    -Causes
    -Indications
    -Recovery
    • Causes- Airspeed, gross weight, PA, and temp
    • Indications- four-per-rev vibrations, increasing torque, loss of alt.
    • Recovery- reduce collective, reduce airspeed, and/or reducing angle of bank.
  45. High-speed yaw maneuver limit
    Above 80 KIAS avoid abrupt, full pedal inputs to prevent excess tail rotor system loading.
  46. Limitations for maneuvering with sling loads
    Maneuvering limitations with a sling load is limited to a maximum of 30° angle of bank in forward flight. Side flight is limited by bank angle and is decreased as airspeed increases. Rearward flight with sling load is limited to 35 knots.
  47. Limitations for maneuvering with rescue hoist loads
    Maneuvering limitations with a rescue hoist load is limited to max of 30° angle of bank in forward flight. Side flight is limited by bank angle and is decreased as airspeed is increased. Rearward flight with hoist load is limited to 35 knots. Rate of descent is limited to 1,000 feet-per-minute.
  48. Bank angle limitation
    Bank angles shall be limited to 30° when a PRI SERVO PRESS caution appears.
  49. Landing gear limitation
    • gross weights up to 16,825 pounds
    • -540 flat and 360 slopes

    • gross weights above 16,825 pounds
    • -300 flat and 180 slopes
  50. Landing speed limitation
    Max forward touchdown speed is limited to 60 knots ground speed on level terrain.
  51. Nose up slope limitations
    NOTE-- slope angle 10° indicated oil pressure of 30 to 35 PSI. 15° range of 10 to 15 PSI is normal

    15° nose-up or wheel up slope reduced by 2° for every 5 knots of wind.

    The main gearbox may be operated up to 30 min with pressure fluctuations when the helicopter is known to be at a nose-up attitude.
  52. Nose down limitations
    •  nose downslope.
    • Landing in downslope conditions with tail winds greater than 15 knots shall not be conducted.
  53. Icing defined
    • When the ambient air temp is 4° or below and visible liquid moisture is present, icing may occur.
    • Trace: LWC 0 to .25 g/m3
    • Light: LWC .25 to .5 g/m3
    • Moderate: LWC .5 to 1.0 g/m3
    • Heavy: LWC greater than 1.0 g/m3
  54. Flight in icing conditions
    • Helicopters with the following equip installed, operational, and turned on are permitted to fly into trace or light icing conditions. Flight into light icing is not recommended without the blade deice kit.
    • 1-Windshield anti-ice
    • 2-Pitot heat
    • 3-ENG Anti-ice
    • 4-ENG Inlet Anti-ice Modulating Valve
    • 5-Insulated Ambient Air Sensing tube

    Flight into moderate icing will also have bade deice kit installed, operational and on.

    Flight into heavy or severe icing is prohibited.

    Helicopters equipped with blade erosion kit are prohibited from flight into icing conditions.
  55. ENG and ENG Inlet Anti-Ice Limitations
    At ENG power levels of 10% TRQ per ENG and below, full anti-ice capability cannot be provided, due to ENG bleed limitations. Avoid operation under conditions of extreme low power requirements such as high rate of descent (1900 fpm or greater), or ground operation below 100% RPM R, during icing conditions. The cabin heating system should be turned off before initiating a high rate of descent.
  56. Backup HYD Pump hot weather limitations
    • -54° to 32° -- unlimited
    • 33° to 38° -- 24min operate 72 rest
    • 39° to 52° -- 16min operate 48 rest
  57. APU operating limitations
    To prevent APU overheating, APU operation at ambient temp of 43° and above with ENG and rotor op, is limited to 30 min. W/ ENG and rotor NOT operating, the APU may be operated continuously up to an ambient temp of 51°.
  58. Windshield anti-ice limitations
    Windshield anit-ice check shall not be done when FAT is over 27°.
  59. Turbulence and Thunderstorm operation
    • -intentional flight into severe turbulence is prohibited.
    • -intentional flight into thunderstorms is prohibited.
    • -Intentional flight into turbulence with a sling load attached and an inoperative collective pitch control friction is prohibited.
  60. Chemical mask considerations
    • -reduces the field of regard to the user
    • -Users should conduct ground familiarity drills (blind switch/control identification) and crew coordination exercises.
    • -mask hose should be secured to the vest to eliminate potential snagging of the flight controls
  61. Gust lock limitations
    • WARNING--Before ENG ops can be performed with the gust lock engaged, all main rotor tiedowns shall be removed.
    • a.DE op with gust lock engaged is prohibited.
    • b.SE op with gust lock engaged will be performed by authorized pilot(s) at IDLE only.
    • c.Gust lock shall not be disengaged with ENG running.
  62. AN/ASN-128 Doppler/GPS Limitations
    • a. The AN/ASN-128B shall not be used as the primary souce of navigation information for IFR ops in controlled airspace.
    • b. Use of GPS landing mode of CIS is prohibited under IMC.
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Blackhawk limits
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blackhawk limits
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