A military T39 flight crew started a descent in response, apparently, to another aircraft's clearance. The ARTCC radar controller intervened and the flight crew returned to their assigned altitude.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	356910
Time
Date	199612
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cew
State Reference	FL
Altitude	msl bound lower : 23000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	other
Make Model Name	Sabreliner 65
Operating Under FAR Part	other : other
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	instruction : instructor oversight : pic
Qualification	pilot : atp pilot : military
Experience	flight time last 90 days : 90 flight time total : 11300 flight time type : 3670
ASRS Report	356910
Person 2
Affiliation	Other
Function	flight crew : captain
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Civilian contract pilot in left seat, military flight officer student in right seat, military mission commander (instructor) in jump seat between pilot and student. Level at assigned altitude of FL250. Instructor and student thought they heard clearance from center to descend to 17000 ft. Student made radio call that he was leaving FL250 for 17000 ft. Pilot started descent. At approximately FL230 ZJX informed flight that they had not been cleared to descend. Pilot climbed back to FL250.

Original NASA ASRS Text

Title: A MIL T39 FLC STARTED A DSCNT IN RESPONSE, APPARENTLY, TO ANOTHER ACFT'S CLRNC. THE ARTCC RADAR CTLR INTERVENED AND THE FLC RETURNED TO THEIR ASSIGNED ALT.

Narrative: CIVILIAN CONTRACT PLT IN L SEAT, MIL FLT OFFICER STUDENT IN R SEAT, MIL MISSION COMMANDER (INSTRUCTOR) IN JUMP SEAT BTWN PLT AND STUDENT. LEVEL AT ASSIGNED ALT OF FL250. INSTRUCTOR AND STUDENT THOUGHT THEY HEARD CLRNC FROM CTR TO DSND TO 17000 FT. STUDENT MADE RADIO CALL THAT HE WAS LEAVING FL250 FOR 17000 FT. PLT STARTED DSCNT. AT APPROX FL230 ZJX INFORMED FLT THAT THEY HAD NOT BEEN CLRED TO DSND. PLT CLBED BACK TO FL250.

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