NORDO flight crew of FA10 squawk 7500 vice 7600. Met by leos upon landing.

Attributes
ACN	739115
Time
Date	200705
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl single value : 37000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air taxi
Make Model Name	Falcon 20FJF/20C/20D/20E/20F
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 53 flight time total : 390 flight time type : 3
ASRS Report	739115
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : far
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

We were on a flight to ZZZ. Upon reaching FL370; we lost communication. The captain told me to squawk 7500; I agreed. After 15-20 mins; we realized that we needed to put 7600; not 7500; so we did. My communications did not work at all. The captain got one of his to partly work getting clearance to land at ZZZ. After landing; we were surrounded by 20+ cop cars and guns drawn. We made a huge mistake and will never happen again.

Original NASA ASRS Text

Title: NORDO FLT CREW OF FA10 SQUAWK 7500 VICE 7600. MET BY LEOS UPON LANDING.

Narrative: WE WERE ON A FLT TO ZZZ. UPON REACHING FL370; WE LOST COM. THE CAPT TOLD ME TO SQUAWK 7500; I AGREED. AFTER 15-20 MINS; WE REALIZED THAT WE NEEDED TO PUT 7600; NOT 7500; SO WE DID. MY COMS DID NOT WORK AT ALL. THE CAPT GOT ONE OF HIS TO PARTLY WORK GETTING CLRNC TO LAND AT ZZZ. AFTER LNDG; WE WERE SURROUNDED BY 20+ COP CARS AND GUNS DRAWN. WE MADE A HUGE MISTAKE AND WILL NEVER HAPPEN AGAIN.

Data retrieved from NASA's ASRS site as of January 2009 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.