Landing Controllability Check

Gulfstream GVII

Eddie sez:

The purpose of a landing controllability check is to see if you can get the airplane into its normal landing configuration and speed at a high enough altitude to give yourself some recovery room if things don't go well, and if that isn't possible, to see how much configuration you can do and how slowly you can fly. Once you've done this at a comfortable altitude, you will know with greater confidence how much flap you can use and what approach speed you can fly when it comes time to land for real.

Everything here is from the references shown below, with a few comments in an alternate color.

Last revision:

20191019

AFM Procedure

[AFM, §03-13-10]

Corrective Action

  1. Altitude . . . 5000 feet AGL minimum

  2. LANDING GEAR . . . DOWN
  3. CAUTION

    CREW SHOULD BE PREPARED TO STOP FLAP MOVEMENT IF AIRPLANE RESPONSE BECOMES OBJECTIONABLE.

  4. FLAPS . . . As required for safe landing with optimum control

  5. If the available YAW trim is insufficient:
  6. a. POWER LEVERS . . . Use asymmetric thrust (as required)

  7. Airspeed . . . Decrease until control becomes marginal or a minimum of VREF

  8. Simulated Approach, Flare, and Go-Around . . . Perform (5000 feet AGL minimum)
  9. CAUTION

    IF LANDING CONTROLLABILITY CHECK REVEALS SIGNIFICANT AFT CONTROL STICK FORCES ARE REQUIRED FOR APPROACH AND LANDING, DELAY SPEED REDUCTION / FLAP SETTING TO MINIMIZE DURATION OF HIGH CONTROL FORCES.

  10. Airspeed . . . Determine appropriate approach airspeed not less than VREF

Technique

images

Photo: Frozen stab controllability check example
Click photo for a larger image

See Controllability Check for general techniques on how to safely accomplish a landing controllability check. The GVII flight control display gives you an excellent presentation of how much elevator travel you have with a frozen stabilizer. The top view show here is of a normally faired stabilizer and elevator. As you reduce speed during a controllability check (middle view) you will see the elevator move toward its limit. You know that as you get to the upper limit of travel (bottom view) you will have nothing left with which to flare the airplane. So make sure you go no slower than where you will have something left.


Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019

Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019