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AFM Procedure

[AFM, §3E-10-00]

PRED WINDSHR displayed on PFD.

  • NOTE: Aural alerting: "Warning Windshear Ahead".

  • Weather radar senses windshear ±25° from the aircraft track and from 0.5 nm to 1.5 nm in front of the aircraft.

  • Takeoff.

    1. Abort takeoff (if possible).

    2. Once airborne avoid depicted windshear areas on Map and HSI. Be prepared to execute a windshear escape maneuver if the Warning reactive windshear alerting occurs.

  • Final Approach.

    1. Go-around.

    2. Avoid depicted windshear areas on Map and HSI.

    3. Be prepared to execute a windshear escape maneuver if the Warning reactive windshear alerting occurs.

WINDSHEAR icon displayed on PFD.

[AFM, §3E-10-00]

  • GPWS senses adverse windshear condition.

    1. AP / A/T: Disconnect.

    2. Pitch: Smoothly increase using up to full aft stick (30° pitch maximum)

    3. Power Levers: Full forward.

    4. Once safe climb out is assured: Gear / Flaps: Retract.

Technique

So what is the difference between wind shear and predictive windshear? It boils down to proximity. An amber predictive windshear looks out 3 miles, a red predictive windshear looks out 1.5 miles.

[Pilot Client Initial Guide, pp. 5-97 to 5-98]

    Normal Takeoff with Windshear Encounter

  • Read AFM Warning Messages – Other Messages under Windshear for the Escape Procedure. The G500/G600 has tremendous thrust capability, so the initial Windshear recovery if done correctly is not very difficult. However, The AFM procedure is to fly pitch so you must use the Boresight and not FPM and FPV.

  • Most problems occur after the Windshear event is over because the aircraft climbs and accelerates so rapidly, that altitude busts and airspeed red line busts are very easy to do.

  • The best practice for the post Windshear environment is to have a standard plan for setting up the GP so that you get out of the Windshear modes, and into modes that will capture altitudes and maintain airspeeds.

  • An excellent technique when you are out of the Windshear is to call for Flight Level Change, Manual Speed 250, then re-engage the Autothrottles.

  • Once the Autothrottles are re-engaged, aggressively pitch the aircraft into the command bars and use pitch trim to neutralize stick pressure and engage the autopilot. Your initial pitch movement into the command bars generally has to be quite aggressive because the aircraft will most likely be considerably out of trim.

  • The autopilot will now stay in Flight Level Change until the cleared altitude is captured, and the Autothrottles will maintain 250 knots.

  • Report the Windshear event to ATC, and the procedure is complete.

  • If predictive Windshear is selected off and a Windshear caution is encountered the caution is displayed on the PFD and not in the HUD.

  • Normal Landing with Windshear Encounter

  • When encountered on approach, the Windshear recovery technique will be identical to the recovery technique on departure. Remember not to change the aircraft configuration until safely out of the Windshear condition. Also, remember to press TO/GA when the decision has been made to go around. You may not be able to immediately fly the missed approach as published, or as directed by ATC until out of the Windshear condition, but this will sequence the FMS and allow for the most accurate fight guidance once control can be maintained.

References

Gulfstream GVII-G500 Airplane Flight Manual, Revision 1, August 31, 2018

Gulfstream GVII-G500 Production Aircraft Systems, Revision 1, Oct 1, 2018

Revision: 20190603
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