B767 crew overshot descent altitude clearance by 100 ft. Aircraft below them received a TCASII RA and they received a TCASII TA.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	407242
Time
Date	199806
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ock airport : lhr
State Reference	FO
Altitude	msl bound lower : 6900 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lhr
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	407242
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	407240
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 2200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Near ock VOR, descending left turn around rain showers to FL70, captain descended to 6900 ft. TCASII gave a traffic warning and captain returned to 7000 ft. London controller asked our altitude and we replied FL70. He said since the other aircraft below us had a TCASII report, he was going to file a report. Aircraft below indicated 2200 ft below us. Our aircraft never went more than 100 ft below assigned altitude. Supplemental information from acn 407240: while applying back pressure for the leveloff in the turn, TCASII warning came on with traffic. My first reaction was to undo what I was doing, so I relaxed the back pressure and looked at the TCASII screen which revealed traffic below us indicating -2200 ft. I reapplied back pressure to level off and descended through the assigned altitude. We did not have an RA but we are not sure if the other aircraft below did. He was climbing and we were descending which may have triggered the alert.

Original NASA ASRS Text

Title: B767 CREW OVERSHOT DSCNT ALT CLRNC BY 100 FT. ACFT BELOW THEM RECEIVED A TCASII RA AND THEY RECEIVED A TCASII TA.

Narrative: NEAR OCK VOR, DSNDING L TURN AROUND RAIN SHOWERS TO FL70, CAPT DSNDED TO 6900 FT. TCASII GAVE A TFC WARNING AND CAPT RETURNED TO 7000 FT. LONDON CTLR ASKED OUR ALT AND WE REPLIED FL70. HE SAID SINCE THE OTHER ACFT BELOW US HAD A TCASII RPT, HE WAS GOING TO FILE A RPT. ACFT BELOW INDICATED 2200 FT BELOW US. OUR ACFT NEVER WENT MORE THAN 100 FT BELOW ASSIGNED ALT. SUPPLEMENTAL INFO FROM ACN 407240: WHILE APPLYING BACK PRESSURE FOR THE LEVELOFF IN THE TURN, TCASII WARNING CAME ON WITH TFC. MY FIRST REACTION WAS TO UNDO WHAT I WAS DOING, SO I RELAXED THE BACK PRESSURE AND LOOKED AT THE TCASII SCREEN WHICH REVEALED TFC BELOW US INDICATING -2200 FT. I REAPPLIED BACK PRESSURE TO LEVEL OFF AND DSNDED THROUGH THE ASSIGNED ALT. WE DID NOT HAVE AN RA BUT WE ARE NOT SURE IF THE OTHER ACFT BELOW DID. HE WAS CLBING AND WE WERE DSNDING WHICH MAY HAVE TRIGGERED THE ALERT.

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.