Altitude deviation altitude excursion during flight crew response to TCASII RA.

Attributes
ACN	291150
Time
Date	199412
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cty
State Reference	FL
Altitude	msl bound lower : 28000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-8 62
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 13000 flight time type : 8000
ASRS Report	291150
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 101 flight time total : 6505 flight time type : 101
ASRS Report	291143
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Level at FL280 under ZJX control, TCASII alerted 'traffic' at 3 O'clock, about 3 mi, about 1600 ft below us. VMC allowed us to quickly spot the dc-8 and see that it was on a converging path and climbing. The TCASII next alerted 'climb,' and we climbed to FL290 to avoid a possible collision. The dc-8 seemed to pass within 500 ft of us, but since we perceive other aircraft closer than they normally are, I think 3000 ft is probably a realistic guess. The conflict aircraft appeared to be a dc-8, and apparently thought he had been cleared to FL370 when in fact he had been cleared to FL270. Chalk up another save for TCASII, and thank goodness we have it.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION DURING FLC RESPONSE TO TCASII RA.

Narrative: LEVEL AT FL280 UNDER ZJX CTL, TCASII ALERTED 'TFC' AT 3 O'CLOCK, ABOUT 3 MI, ABOUT 1600 FT BELOW US. VMC ALLOWED US TO QUICKLY SPOT THE DC-8 AND SEE THAT IT WAS ON A CONVERGING PATH AND CLBING. THE TCASII NEXT ALERTED 'CLB,' AND WE CLBED TO FL290 TO AVOID A POSSIBLE COLLISION. THE DC-8 SEEMED TO PASS WITHIN 500 FT OF US, BUT SINCE WE PERCEIVE OTHER ACFT CLOSER THAN THEY NORMALLY ARE, I THINK 3000 FT IS PROBABLY A REALISTIC GUESS. THE CONFLICT ACFT APPEARED TO BE A DC-8, AND APPARENTLY THOUGHT HE HAD BEEN CLRED TO FL370 WHEN IN FACT HE HAD BEEN CLRED TO FL270. CHALK UP ANOTHER SAVE FOR TCASII, AND THANK GOODNESS WE HAVE IT.

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.