6. PA/SRA Flashcards
What action is to be taken by a Talkdown controller if, after allowing sufficient time for the pilot to establish RT contact on the talkdown frequency after handover, no call is received?
The controller should transmit instructions to the pilot, which involve a change of attitude in azimuth or elevation, or if it can be checked, a specific operation of the AS transponder. Visual evidence of compliance will confirm that the pilot is receiving his instructions and will enable the controller to continue the talkdown after informing the pilot of his intention to do so.
What actions should the Talkdown controller take if the approach has to be terminated due to radar fault/failure:
a. Early in the Procedure?
Where possible, arrange for the approach to continue as a SRA, or resume the precision approach if the fault is rectified.
What actions should the Talkdown controller take if the approach has to be terminated due to radar fault/failure:
b. At Any Stage?
Handover the AS to the Director/RA controller with appropriate RT instructions.
What actions should the Talkdown controller take if the approach has to be terminated due to radar fault/failure:
c. Before a Positive Final Clearance?
Instruct the pilot to contact the ADC for clearance to join the visual circuit, or break off the approach and execute the missed approach procedure, or to ‘fly-through deadside’ (if local procedures permit), depending upon whether the pilot is visual with the aerodrome.
What actions should the Talkdown controller take if the approach has to be terminated due to radar fault/failure:
d. After a Positive Final Clearance?
Instruct the pilot to continue iaw the issued clearance, or to carry out a missed approach procedure, depending upon whether the pilot is visual with the aerodrome.
What action should be taken in the event of a loss of radar contact/merged contact:
a. Less then 3 secs?
Control of the AS may be resumed provided that the AS is within one nm of the position that the contact was lost, is correlated and the new contact’s track can be directly matched/related to that of its history trails.
What action should be taken in the event of a loss of radar contact/merged contact:
b. Three secs or more?
If a radar contact is regained after 3 secs and/or outside one nm of the position that the contact was lost, the talkdown can or cannot be resumed as follows:
(1) Outside 4nm. Control of the AS may only be resumed once the AS has been formally re-identified.
Identification should only take place if the controller considers there is sufficient time to do so. In order to effect identification, the AS position should be confirmed to the PAR controller by the Surveillance Director, or if it can be checked, a specific operation of the AS transponder.
(2) Inside 4nm. If radar contact is regained within 4nm of touchdown, re-identification should not be carried out. Further action is to be taken in the same
manner as for radar fault/failure.
What action should be taken if an AS on an SRA enters an area of continuous clutter and the approach cannot be continued?
The approach should be terminated, the pilot should be informed of the loss of radar contact, and a missed approach procedure initiated if the pilot cannot continue his approach visually.
What regulations apply to the Internal Aids Approach Procedures?
Internal aids approaches can be used only by AS equipment combinations so cleared in platform Release to Service. The following regulations should apply:
a. Internal aids approaches may only be used at Aerodrome with authorised Aerodrome surveillance radar procedures; approaches need not be radar monitored.
b. The procedures are non-precision and the MDH/MDA should be based on the procedure minimum for the surveillance radar procedure.
c. Using an airborne aid independent of the one in use for the approach or a ground radar fix, the AS crew are to ensure that the AS is within the correct final approach segment before initiating descent on final approach. Subsequently, if any doubt should arise about the AS’s position within the final approach segment, the approach should be abandoned.
When must the Talkdown controller stop passing glidepath and heading information on a PAR approach?
Where possible, glidepath information should be given down to 50ft below the published procedure minimum on PAR. Headings are not passed after DH; the controller should only pass the direction of turn and the number of degrees.
What is Decision Height/Altitude?
A specified height/altitude in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.
What is Minimum Descent Height?
The lowest height to which an AS may descend until the required visual references have been established and the AS is in a suitable position to continue with a visual approach.
What is Missed Approach Point?
That point in an instrument approach at or before which the prescribed missed approach procedure must be initiated in order to ensure that safe obstacle clearance is accomplished.
What is a Circling Approach?
An approach during which an AS manoeuvres, outside of the 30 degree arc of the centreline of the active runway, in order to achieve a suitable position from which it can continue with a visual approach.
What conditions must exist for a pilot to carry out a Circling Approach?
a. The visual circuit or partial circuit is carried out at or above the specified minimum circling height and within the specified circling approach area.
b. The in-flight visibility assessed by the pilot is not less than the minimum value for circling approaches specified by his Aviation Duty Holder and the Accountable Manager (Military Flying) (AM(MF)).
c. The AS’s position relative to the Aerodrome or approach facility in use has been established and can be continually monitored either visually or by range and bearing.
