<< >> NASA ASRS Report 1112193, August 2013

Air carrier initiated a descent but was questioned by ATC regarding a possible same company mix-up; i.e. The clearance was issued to a company flight.

Attributes
ACN	1112193
Time
Date	201308
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 170 Flight Crew Type 170
Events
Anomaly	ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

While cruising at FL380; I thought I heard our call sign and said to the captain; 'I think that was us.' we didn't respond and; a few seconds later; ATC said; 'company flight number; descend to FL320.' I replied to the clearance and started a VNAV descent. At 36;500 ft; ATC instructed us to climb to FL380. The captain told ATC we would have to climb and that we were descending to FL320. ATC then asked if we wanted FL360. The captain said yes. ATC gave us FL360 and also stated we may have taken someone else's call.

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Original NASA ASRS Text

Title: Air Carrier initiated a descent but was questioned by ATC regarding a possible same company mix-up; i.e. the clearance was issued to a company flight.

Narrative: While cruising at FL380; I thought I heard our call sign and said to the Captain; 'I think that was us.' We didn't respond and; a few seconds later; ATC said; 'Company Flight Number; descend to FL320.' I replied to the clearance and started a VNAV descent. At 36;500 FT; ATC instructed us to climb to FL380. The Captain told ATC we would have to climb and that we were descending to FL320. ATC then asked if we wanted FL360. The Captain said yes. ATC gave us FL360 and also stated we may have taken someone else's call.

Data retrieved from NASA's ASRS site as of July 2013 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.