AH-64D LONGBOW (CH 5)

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Author:
max64d
ID:
4441
Filename:
AH-64D LONGBOW (CH 5)
Updated:
2010-01-18 17:04:39
Tags:
OPERATING LIMITS -10 APACHE
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Description:
CHAPTER 5 OPERATING LIMITS
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  1. Tapes are displayed in three different widths and colors based on current operating range:
    NARROW: entire tape is green; indicates safe or normal range of operation

    • MEDIUM: entire tape is yellow; indicates range when special attention should be given to operation
    • WIDE: entire tape is red; indicates the limit above or below which continued operation is likely to cause damage or shorten component life
  2. Graphic symbols are displayed in conjunction with each vertical tape to provide instrument markings:
    Red horizontal bar and diamond symbols indicate the maximum operating limit

    Yellow horizontal bar indicates the beginning of a sub-range cautionary operating range
  3. LIMIT -- NR (%) Digital Readout
    • 110..........Maximum (>110 red)
    • 106-110....Transient operation (yellow)
    • 106 .........High rotor warning annunciated
    • 95-105......Normal operation (green)
    • 0--94 ......Transient operation (red)
  4. LIMITS -- ENGINE 1 OR 2 OIL PRESSURE (PSI)
    • 120.........Maximum (>120 red w/box)
    • 23-120.....Normal operation (green)
    • 23...........Minimum (<23 red)
  5. LIMITS -- HYDRAULIC PRESSURE
    • >3410..........Transient operation permitted for 5 seconds (yellow) (≥ 5 seconds RED w/box)
    • 3310-3400.....Transient operation permitted for 5minutes (yellow) (≥ 5 minutes red w/ box)
    • 2750-3300....Normal operation (green)
    • 1260.............Minimum (<1260 red w/box)
  6. ENGINE STARTER/STARTING LIMITATIONS
    • Engine Starter Limitations
    • The pneumatic starter is capable of making the number of consecutive
    • start cycles listed below, when exposed to the environmental
    • conditions specified, with an interval of at least 60
    • seconds between the completion of one cycle and the beginning
    • of the next cycle. A starting cycle is the interval
    • from start initiation and acceleration of the output drive
    • shaft, from zero rpm, to starter dropout. The 60 second
    • delay between start attempts applies when the first attempt
    • is aborted for any reason and it applies regardless
    • of the duration of the first attempt. If motoring is required
    • for an emergency, the 60 second delay does not apply.
    • Engine Starts At Ambient Temperatures of 61
    • °F (16 °C) and Below. Two consecutive start cycles
    • may be made, followed by a 3 minute rest period, followed
    • by two additional consecutive start cycles. A 30 minute
    • rest period is then required before any additional
    • starts.
    • Engine Starts At Ambient Temperatures Above
    • 61 °F (16 °C). Two consecutive start cycles may be
    • made. A 30 minute rest period is then required before any
    • additional starts.
    • Dual Engine Starts. Dual engine starts are prohibited
    • due to insufficient IPAS air.
  7. LIMITS -- 701 TGT (°C) DIGITAL READOUT
    • 965...........Maximum (>965 red)
    • 920-965....Single engine transient, 12 second limit (yellow)
    • 865-919....Single engine contingency, 2.5 minute limit (yellow)
    • 869...........Maximum during start
    • 808-864....Intermediate rated power, 30 minute limit (yellow)
    • 807...........Maximum continuous power
    • 0--807.......Normal operation (green)
  8. 701 Engine TGT limiter control which limits engine operation according to the following indicated TGT values:
    Dual Engine: 860 +/-- 12 (848--872)° C

    Single Engine: 917 +/-- 12 (905--929)° C
  9. LIMITS -- 701C TGT (°C) DIGITAL READOUT
    • 949...........Maximum (>949 red)
    • 897-949.....Single engine transient, 12 second limit (yellow)
    • 879-896.....Single engine contingency, 2.5 minute limit (yellow)
    • 871--878....Intermediate rated power, 10 minute limit (yellow)
    • 851............Maximum during start
    • 811-870......Intermediate rated power, 30 minute limit (yellow)
    • 810............Maximum continuous power
    • 0--810.......Normal operation (green)
  10. 701C TGT limiter control which limits engine operation according to the following indicated TGT values:
    Dual Engine: 867 +/-- 12 (855--879)° C

    Single Engine: 896 +/-- 12 (884--908)° C
  11. LIMITS -- ENGINE1 OR 2 NP (%) Digital Readouts
    • 121..........Maximum (>121 red w/box).
    • 115..........Engine overspeed annunciated
    • 106-121....Transient operation, 12 seconds (yellow, w/box at 107).
    • 0-105........Normal operation (green)
  12. LIMITS -- ENGINE1 OR 2 NG (%) DIGITAL READOUT
    • 105.1............Maximum (>105.1 red)
    • 102.3-105.1...Transient 12 second limit (yellow)
    • 63.1-102.2.....Normal operation (green)
    • 63................Minimum engine out warning annunciated (<63.0 red w/box).
  13. LIMITS -- TORQUE (%) DIGITAL READOUT
    • SINGLE ENGINE
    • 125...........Maximum (>125 red)
    • 123-125.....Transient 6 second limit (yellow)
    • 111-122.....Single engine contingency, 2.5 minute limit (yellow).
    • 110...........Single engine maximum continuous power (green)
    • 0-110.........Normal operation (green)
    • DUAL ENGINE
    • 115..........Maximum ( >115 red)
    • 101-115....Transient 6 second limit (yellow).
    • 0-100.......Normal operation (green).
    • WITH NR LESS THAN 90%
    • 70......Maximum (>70 red)
    • 0-70...Normal operation (green)
    • WITH NR LESS THAN 50%
    • 30......Maximum (>30 red)
    • 0-30...Normal operation (green)
  14. AUXILIARY POWER UNIT (APU) OPERATING LIMITS
    • CAUTION
    • Avoid prolonged operation at 94% -- 96%
    • NR with the APU running. The APU clutch
    • will oscillate from engaged to disengaged.
    • This creates high loads on the
    • clutch and shall be avoided.
    • APU OPERATING LIMITATIONS
    • APU operation is prohibited during normal flight. After a fault or aborted
    • start, wait 30 seconds after compressor has stopped before
    • attempting another start. After 2 consecutive start attempts,
    • wait 20 minutes before third start attempt. No
    • more than 3 start attempts are permitted in one hour.
    • CAUTION
    • Do not operate the APU for more than 5
    • minutes at a main transmission oil temperature
    • of 120 -- 130° C. Shut down APU
    • to prevent damaging accessory gearbox
    • components.
    • EXTENDED APU GROUND OPERATIONS
    • During prolonged ground operations greater than 30 minutes, observe
    • XMSN TEMP 1 and XMSN TEMP 2 on the SYS
    • page. If the temperatures exceed 130° C (266° F) the
    • APU shall be shutdown and the transmission fluid allowed
    • to cool for 30 minutes prior to resuming APU ground operations;
    • or transmission fluid may be cooled by operating
    • an engine with rotor turning. There is no requirement to
    • remove transmission side panels during extended APU
    • ground operations. However, the transmission fluid will
    • not get as hot under high ambient temperature conditions
    • if the side panels are removed.
  15. AIRCRAFT WEIGHT LIMITATION
    The aircraft maximum gross weight is 20,260 pounds, except for non--tactical ferry flights, which may not exceed 23,000 pounds.
  16. VNE AIRSPEED
    • See figure 5-13 to determine the Never Exceed Velocity
    • (VNE) as a function of weight, altitude and temperature.
  17. MAX AIRSPEED FOR AUTOROTATION
    • Maximum airspeed for autorotation is 145 KTAS. Above 145 KTAS,
    • drag on the rotor system will cause NR to decay
  18. AIRSPEED LIMITS W/ ONE ENG INOP
    • Maximum airspeed with one engine inoperative is
    • the greater of:

    • a. 67% of VNE determined from figure 5-13 using the
    • GROSS WEIGHT line. Above this, a successful autorotation
    • may not be possible due to NR decay

    • b. The speed for minimum power determined from
    • the Chapter 7 or Chapter 7A cruise charts using
    • the MAX END/MAX R/C lines
  19. Maximum Rearward/Sideward Flight Speed
    • Maximum rearward/sideward flight speed is 45
    • KTAS for all gross weights.
  20. Maximum Airspeed for Searchlight Extension.
    • The searchlight is designed for operation (extend/ retract/rotate) at speeds up to 90 knots. However, as long
    • as operation is not attempted, the lighthead can be left in any extended position at speeds up to 200 knots.
  21. Maximum Airspeed with Symmetrically Loaded External Fuel Tanks (2 or 4) Installed
    Maximum airspeed with symmetrically loaded external fuel tanks (2 or 4) installed is 130 KTAS to prevent structural damage to the airframe.
  22. Maximum Airspeed for Stores Jettison.
    • Jettison of external armament stores is not authorized except
    • for emergency conditions and then only from unaccelerated
    • flight during:

    a. Maximum airspeed for stores jettison is 130 KTAS.

    b. Hover to 45 KTAS (minimize side slip, if possible).

    c. 45 to 130 KTAS (ball centered, if possible).
  23. Maximum Airspeed for External Tanks Jettison
    • Jettison of external fuel tanks is not authorized except for emergency conditions and then only from airspeeds
    • less than 100 KTAS.

    • Jettison from level flight if possible, and if not, jettison at an airspeed which minimizes
    • the rate of descent at the time of jettison.
  24. MANEUVERING LIMITS

    -Load factors

    -Intentional maneuvers beyond...

    -Prevent Excessive Tail Rotor Loads

    -Flight with Canopy Enclosure Open

    -Landing limitations
    -For normal load factors, refer to figure 5-14.

    • -Intentional maneuvers beyond attitudes ± 30° in pitch or ± 60° in roll
    • are prohibited.

    • -Avoid large pedal step inputs in arresting right hovering/low
    • speed yawing turns greater than 60°/second. This is to prevent excessive tail rotor drive system loads.

    -Flight,hovering flight and air taxiing with the canopy enclosure open are prohibited, except for smoke/fume elimination.

    • -Do not complete a landing on terrain which produces a pitch attitude change from a hover
    • greater than 7° nose up or 12° nose down; or a roll attitude greater than 10°. Data is not available beyond these limits at gross weights above 17,650.
  25. EXTERNAL TANKS With external fuel tanks (2 or 4)
    containing fuel, symmetrically installed, the following restrictions
    apply:
    a. Normal load factor of 2 Gs shall not be exceeded

    • b. Maneuvers are limited to those required to takeoff,
    • climb to optimum altitude, heading/course corrections, obstacle
    • avoidance, descend and land

    • c. 230 gal external fuel tanks shall be in the flight stow
    • position (4° nose-up) with respect to the waterline (WL)

    • d. Rapid and step-shaped pedal inputs in excess of
    • 1/2 in. shall be avoided

    • e. Operation of the aircraft with the 230--gallon Extended
    • Range Fuel System (ERFS) is prohibited during
    • operations where hostile fire is highly probable
  26. Flight into Turbulence
    • Flight into known or forecast extreme turbulence or into known severe turbulence
    • is prohibited
  27. Flight In Icing Conditions
    Intentional flights into moderate icing conditions are prohibited. Flight into known or forecast trace or light icing conditions is authorized and not considered a hazard unless the condition is encountered for an extended period (over one hour).
  28. Flight In Instrument Meteorological Conditions.
    The aircraft is not qualified for IMC flight. The back-up flight instruments are required to be installed and operational for all flights.
  29. Rotor Limitations -- Start and Stop Limits
    • Maximum wind velocity for rotor start or stop is 45
    • knots to prevent droop stop damage.
  30. USE OF FORCE TRIM
    Force trim will not be selected OFF except in a failed or partial failed mode.

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