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A310 Operation in Windshear / Downburst Conditions

 
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K.Haroon
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PostPosted: Sun Jan 30, 2011 5:04 am    Post subject: A310 Operation in Windshear / Downburst Conditions Reply with quote

A310 OPERATION IN WINDSHEAR / DOWNBURST CONDITIONS
FCOM>>Procedure and Techniques >>Inclement Weather Operation
Download as a PDF File


Precautions into Suspected or Known Windshear Conditions:

Before Takeoff:

- Delay Takeoff (until conditions improve).

- Favorable Runway (in reference to location of likely windshear/downburst condition).

- Lowest Flap Setting (compatible with takeoff requirement to maximize climb gradient).

- Weather Radar (to analyze the flight path).

- Maximum Takeoff Power (TOGA).

- Monitor Airspeed (early evidence of windshear).

- Select FPV after triggering Go Levers (on PFD of PNF).


During Approach:

- Delay Landing (until conditions are more favorable or divert).

- Favorable Runway (in conjunction with an appropriate approach aid).

- Select FPV (on PFD of PNF).

- Weather Radar (to analyze flight path).

- Flaps 20 for Landing.

- Auto Pilot in CMD (for accurate approach and early information of beam deviation with ILS).

- Set VAPP (wind correction based on reported surface wind).

- Monitor Ground Speed (maintain GS ≥ VAPP – 10 knots).

- Monitor IAS (maintain IAS > VAPP).


Precautions into Predicted Windshear Conditions:


1) Message “W/S AHEAD” on PFD in RED:


Before Takeoff (associated with aural alert “Windshear Ahead”):

- Delay Takeoff.

- Select Favorable Runway (incase you have decided to takeoff).


During Takeoff Run:

- Reject Takeoff (predictive windshear alerts are inhibited above 100 knots and until 50 feet).


After Airborne:

- Max Takeoff Power (TOGA).

- Slats/Flaps Configuration (change as normal, provided windshear condition is not entered).

- Follow SRS Commands (without FD bar, pitch close to but not more than 17.5 deg).


Landing (associated with aural alert “Go Around Windshear Ahead”):

- Max Takeoff Power (TOGA).

- Announce “Go Around Flaps”, retract flaps one step and select landing gear up.

- If no hazard exists, warning may be considered precautionary.



2) Message “W/S AHEAD” on PFD in AMBER:


• Follow “Precautions into Suspected or Known Windshear Conditions”.


Recovery Technique and Procedures:

TAKEOFF

Before V1:

- Reject Takeoff (only if unacceptable airspeed variation occurs and there is sufficient runway remaining).

After V1:

- Disconnect Autothrottle and set Max Takeoff thrust.

- Follow SRS Commands (without FD bar, pitch close to but not more than 17.5 deg).

Initial Climb:

- Disconnect Autothrottle and set Max Takeoff thrust.

- If Auto Pilot is engaged in CMD then keep it engaged otherwise do not engage it.

- Follow SRS Commands (without FD bar, pitch close to but not more than 17.5 deg).

- Monitor flight path (using FPV on PFD of PNF) and airspeed.

- Allow airspeed reduction to “intermittent stick shaker” activation (while checking speed margin on PFD).

- No configuration changes (gear, flaps) until out of shear conditions.

- Increase airspeed when positive climb is confirmed.


LANDING

- Trigger Go Levers, Set and maintain Max Go Around Thrust.

- If Auto Pilot is engaged in CMD then keep it engaged otherwise do not engage it.

- Follow SRS Commands (without FD bar, pitch close to but not more than 17.5 deg).

- No configuration changes (gear, flaps) until out of shear conditions.

- Allow airspeed reduction to “intermittent stick shaker” activation (while checking speed margin and speed trend on PFD).

- Monitor flight path (using FPV on PFD of PNF) and airspeed.

- Recover smoothly to normal climb when out of shear condition.

- Increase airspeed when positive climb is confirmed.
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