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(c) Acknowledge code setting instructions by reading back the code to be set;
 
(d) Select Mode C simultaneously with Mode A unless otherwise instructed by an ATS Unit;
 
(e) When reporting levels under routine procedures or when requested by ATC, state the current altimeter reading to the nearest 100ft. This is to assist in the verification of Mode C data transmitted by the aircraft.
 
Note: If, on verification there is a difference of more than 200ft between the level readout and the reported level, the pilot will normally be instructed to switch off Mode C. If independent switching of Mode C is not possible the pilot will be instructed to select Code 0000 to indicate a transponder malfunction.
 
 
 
Special Purpose Codes
 
Some Mode A codes are reserved internationally for special purposes and should be selected as follows:
 
(a) Code 7700. To indicate an emergency condition, this code should be selected as soon as is practicable after declaring an emergency situation, and having due regard for the over-riding importance of controlling aircraft and containing the emergency. However, if the aircraft is already transmitting a discrete code and receiving an air traffic service, that code may be retained at the discretion of either the pilot or the controller;
 
(b) Code 7600. To indicate a radio failure;
 
(c) Code 7500. To indicate unlawful interference with the planned operation of a flight, unless circumstances warrant the use of Code 7700;
 
(d) To indicate an aircraft conducting IFR flight as GAT, where the downlinked aircraft identification is validated as matching the aircraft identification entered in the flight plan;
 
(e) Code 2000. When entering United Kingdom airspace from an adjacent region where the operation of transponders has not been required;
 
(f) Code 7007. This code is allocated to aircraft engaged on airborne observation flights under the terms of the Treaty on Open Skies. Flight Priority Category B status has been granted for such flights and details will be published by NOTAM. Mode C should be operated with all of the above codes;

 
Mode C should be operated with all the above codes.
 
 
Conspicuity Code
 
When operating at and above FL 100 pilots shall select code 7000 and Mode C except:
 
(a) When receiving a service from an ATS Unit or Air Defence Unit which requires a different setting;
 
(b) When circumstances require the use of one of the Special Purpose Codes or one of the other specific conspicuity codes assigned in accordance with the UK SSR Code Assignment Plan as detailed in the table at ENR 1.6.
 
 
When operating below FL 100 pilots should select Code 7000 and Mode C except as above.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(32)