Gulfstream 550 first officer reported that upon takeoff ATC could not pick up the aircraft transpond...

Narrative:

Our gulfstream 550 was observed to have a MCR1 fail cas message prior to departure. The mmel was consulted and relief was provided for this message. The relief is granted with associated comm and nav radios operative and opposite ATC. A functional check of all comms was made and ADF 1 was found to be failed as seen clearly by dashed lines. All other buttons and functions on the radio control page of our mdcus appeared to work normally. There were no other indications of problems. Upon takeoff ATC could not pick up our transponder and our attempt was made to switch to number 2. Now inflight; the buttons for TCAS and transponder control were frozen. No transponder was available for ATC. Air traffic control was extremely helpful. They allowed us to climb to FL270 and continue our flight. No difficulties or problems were encountered. Perhaps a positive selection to transponder #2 prior to takeoff in this condition would allow normal ops. After landing; the aircraft was shut down and 20 minutes later restarted. The frozen buttons (TCAS and transponder) were now working again so 'air mode' appeared to play a part. VOR 1 also failed enroute; seemingly from computer blocking auto-tune function and true function. The MEL of the 'MRC1' amber message and ADF 1 inop was completed by our maintenance department prior to departure.

Original NASA ASRS Text

Title: Gulfstream 550 First Officer reported that upon takeoff ATC could not pick up the aircraft transponder and an attempt was made to switch to the number 2. The buttons for TCAS and transponder control were frozen; so no transponder was available for ATC.

Narrative: Our Gulfstream 550 was observed to have a MCR1 FAIL CAS message prior to departure. The MMEL was consulted and relief was provided for this message. The relief is granted with associated comm and nav radios operative and opposite ATC. A functional check of all comms was made and ADF 1 was found to be failed as seen clearly by dashed lines. All other buttons and functions on the radio control page of our MDCUs appeared to work normally. There were no other indications of problems. Upon takeoff ATC could not pick up our transponder and our attempt was made to switch to number 2. Now inflight; the buttons for TCAS and transponder control were frozen. No transponder was available for ATC. Air Traffic Control was extremely helpful. They allowed us to climb to FL270 and continue our flight. No difficulties or problems were encountered. Perhaps a positive selection to transponder #2 prior to takeoff in this condition would allow normal ops. After landing; the aircraft was shut down and 20 minutes later restarted. The frozen buttons (TCAS and Transponder) were now working again so 'air mode' appeared to play a part. VOR 1 also failed Enroute; seemingly from computer blocking auto-tune function and true function. The MEL of the 'MRC1' amber message and ADF 1 inop was completed by our maintenance department prior to departure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1398567
Time
Date	201610
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Gulfstream V / G500 / G550
Operating Under FAR Part	Part 91
Flight Phase	Parked Climb
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Transponder
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 14000 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Gulfstream 550 first officer reported that upon takeoff ATC could not pick up the aircraft transponder and an attempt was made to switch to the number 2. The buttons for TCAS and transponder control were frozen; so no transponder was available for ATC.