During climb talking with departure controller received an erroneous clearance to descend to 14000' not issued by controller. Immediately received clearance from controller to climb to 17000'.

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Attributes
ACN	80414
Time
Date	198801
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lga
State Reference	NY
Altitude	msl bound lower : 15000 msl bound upper : 17000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : bos
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 11600 flight time type : 1800
ASRS Report	80414
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6400 flight time type : 40
ASRS Report	80419
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Departing lga our initial clearance altitude was 5000'. When lga departure control was contacted they clrd us to 15000'. I acknowledged the clearance to 15000'. Then, when ny departure was contacted with the report of climbing to 15000', departure control acknowledged and advised to stand by for higher. Shortly after leveling at 15000', departure control asked us to verify our altitude as 15000'. We did and a different voice on what sounded like a different transmitter clrd us to 14000', followed immediately by the original voice clearing us to 17000'. We asked for confirmation and received clearance to 17000'. We were either given the wrong altitude by lga departure control or someone on an unauthorized radio gave us a clearance to 14000'. Supplemental information from acn 80419: the center radios were unreadable with several complaints from other aircraft in the area. This could have been a contributing factor in the incident.

Original NASA ASRS Text

Title: DURING CLIMB TALKING WITH DEP CTLR RECEIVED AN ERRONEOUS CLRNC TO DESCEND TO 14000' NOT ISSUED BY CTLR. IMMEDIATELY RECEIVED CLRNC FROM CTLR TO CLIMB TO 17000'.

Narrative: DEPARTING LGA OUR INITIAL CLRNC ALT WAS 5000'. WHEN LGA DEP CTL WAS CONTACTED THEY CLRD US TO 15000'. I ACKNOWLEDGED THE CLRNC TO 15000'. THEN, WHEN NY DEP WAS CONTACTED WITH THE RPT OF CLBING TO 15000', DEP CTL ACKNOWLEDGED AND ADVISED TO STAND BY FOR HIGHER. SHORTLY AFTER LEVELING AT 15000', DEP CTL ASKED US TO VERIFY OUR ALT AS 15000'. WE DID AND A DIFFERENT VOICE ON WHAT SOUNDED LIKE A DIFFERENT TRANSMITTER CLRD US TO 14000', FOLLOWED IMMEDIATELY BY THE ORIGINAL VOICE CLEARING US TO 17000'. WE ASKED FOR CONFIRMATION AND RECEIVED CLRNC TO 17000'. WE WERE EITHER GIVEN THE WRONG ALT BY LGA DEP CTL OR SOMEONE ON AN UNAUTH RADIO GAVE US A CLRNC TO 14000'. SUPPLEMENTAL INFORMATION FROM ACN 80419: THE CENTER RADIOS WERE UNREADABLE WITH SEVERAL COMPLAINTS FROM OTHER ACFT IN THE AREA. THIS COULD HAVE BEEN A CONTRIBUTING FACTOR IN THE INCIDENT.

Data retrieved from NASA's ASRS site as of August 2007 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.