CAD 516 Ground Proximity Warning System

8. ACTION TO BE TAKEN ON RECEIVING ALERTS AND WARNINGS
8.1 Basic GPWS
(Equipment which gives no indication of Mode other than Mode 5)
Examples of this equipment are Marconi and Sundstrand Mk 1.
8.1.1 Action To Be Taken On Receiving An Alert
With this type of GPWS, alerts can only be associated with Mode 5 and will
be indicated aurally by repetition of the audio ‘GLIDESLOPE’. The crew is
required to take immediate action to regain the ILS glide slope, which will be
above the aircraft and, in doing so, will cause the alert to cease.
8.1.2 Action To Be Taken On Receiving a Warning
The immediate response must be to select maximum thrust, level the wings,
confirm that speedbrakes are stowed and initiate a maximum gradient climb,
which should be maintained until the aircraft attains the minimum safe altitude
for that part of the route being operated, and the warning ceases. Unless it is
known for certain that maintaining a wings-level attitude will further
compromise terrain clearance, a curved recovery path should not be initiated.
Where a curved path is deemed to be necessary, the establishment of the
maximum climb rate consistent with the required angle of bank must be
adopted. When established in the climb every effort shall be made to
determine the cause of the warning and to verify the aircraft’s position.
Issue 1 11 June 2001