Gulfstream G200 (IAI 1126 Galaxy)
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Landed in Emergency Condition
Aircraft
After approximately 30 minutes in cruise at FL391; No 2 RTU showed signs of intermittent transmit rendering VHF unserviceable for transmit and receive. Initially intermittent but deteriorated as flight continued. Communications switched to No 1 RTU. Shortly afterwards No 1 RTU showed same symptoms. For rest of the flight the symptoms occurred concurrently with very intermittent radio communications. Shortly after VHF transmit indication problems EICAS showed FDR FAIL status message. The message cleared for a short while then reappeared. Continued intermittently for duration of flight. CB reset did not clear the message. Shortly after FDR message the GROUND AIRBRAKES advisory message came on EICAS followed by FLIGHT AIRBRAKES advisory message. Unable to clear after CB reset. This was followed by SLAT/FLAP MAINTENANCE status message. In each instance QRH abnormals were consulted and followed. Nil messages able to be cleared. Even with radio transmission problems; sufficient ATC clearance able to be copied to commence descent and obtain landing runway. Further into the approach no radio contact possible; 7600 selected on transponder and continued approach as per last clearance. On final approach temporary radio communications resulted in allocation of new transponder code and landing clearance obtained. Utilized Follow Me car to locate parking bay. Due SLAT/FLAP MAINTENANCE Status message a NO SLAT/NO FLAP approach and landing carried out as per QRH.
G200 Captain reported intermittent loss of VHF transmit and receive capability along with EICAS indications of flight data recorder; ground/flight airbrakes; and slat/flap failures. Sufficient communication was established for approach and landing clearance to a successful no slat/flap landing.