2.1 EMERGENCY PROCEDURES
In emergency situations, the pilot shall maintain the last assigned code, unless otherwise instructed.
In addition to ENR 1.6.2.1.1, the pilot may select Mode A, Code 7700, whenever he believes that would be the best course of action, in view of the nature of the situation.
A pilot experiencing the radio communication failure shall operate the
SSR transponder to Mode A, Code 7600 and take actions prescribed for such a situation.
The pilot of an aircraft being subject to unlawful interference, shall endeavour to set Mode A, Code 7500, to give the indication of the situation, unless circumstances justify the use of Code 7700.
When
SSR transponder operates incorrectly on Mode C, the pilot shall, unless otherwise instructed, immediately inform
ATC unit concerned and switch off altitude reporting and transmit the framing pulses of the Mode C response. Alternately, he shall switch off completely Mode C if the design of the
SSR transponder does not permit procedures stated above and maintain the Mode A transmission. If the design of the
SSR transponder does not permit Modes A and C being switched off separately, the
SSR transponder shall not be switched off without explicit instruction by
ATC, to ensure continuous transmission of identification and position information via Mode A. When entering the area of responsibility of an
ATC unit, the pilot shall maintain undertaken measures and inform the
ATC accordingly.
Note: Mode A/C, Codes 7500, 7600 and 7700 are permanently monitored in the Sarajevo FIR.