What are TCAS II MEL (Minimum Equipment List) requirements?
The MEL for TCAS II throughout Europe is Class C – 10 days (excluding the day of discovery). Operation under the terms of the EASA-OPS 1 TCAS II MEL has been agreed and accepted by the ECAC Member States. JAA TGL 26 (which is still applicable) states that TCAS II “may be inoperative provided the system is deactivated and secured, and repairs or replacements are carried out within 10 calendar days. Note: Local Authorities may impose a more restrictive rectification interval days.” Additional MEL requirements concerning partial failures are also listed in the TGL 26. Note: the actual MEL period applicable to an aircraft is set by the National Authority of the aircraft operator, but if longer than Class C it would cause operational issues for flight in European airspace. However, one State in Europe applies a more restrictive requirement: in German airspace the time period during which TCAS II may be inoperative is reduced to 3 days (refer to German AIP GEN 1.5 para. 5). This applies to a
