Flight crew of air carrier medium large transport aircraft took evasive action in response to a TCASII RA resulting in an excursion from assigned altitude.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	241273
Time
Date	199305
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : nsf airport : iad
State Reference	MD
Altitude	msl bound lower : 10000 msl bound upper : 10700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 4000 flight time type : 2000
ASRS Report	241273
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 900
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing iad on assigned heading 140 degrees at 10000 ft, TCASII advised TA of approaching aircraft about 10 NM ahead, 900 ft below our altitude and climbing. Washington departure frequency 126.55 was busy -- not getting a word in. TCASII gave an RA and we commenced evasive maneuver/climb as directed by TCASII and immediately advised washington departure at first opportunity of our actions. Shortly thereafter we gained visual on small twin which passed off our left side and low. Washington departure cleared us to continue climb to FL190. We were at 10700 ft starting down when we received that clearance. ATC was extremely busy and controller was not prepared for our actions as it seemed to take him by surprise.

Original NASA ASRS Text

Title: FLC OF ACR MLG ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA RESULTING IN AN EXCURSION FROM ASSIGNED ALT.

Narrative: DEPARTING IAD ON ASSIGNED HDG 140 DEGS AT 10000 FT, TCASII ADVISED TA OF APCHING ACFT ABOUT 10 NM AHEAD, 900 FT BELOW OUR ALT AND CLBING. WASHINGTON DEP FREQ 126.55 WAS BUSY -- NOT GETTING A WORD IN. TCASII GAVE AN RA AND WE COMMENCED EVASIVE MANEUVER/CLB AS DIRECTED BY TCASII AND IMMEDIATELY ADVISED WASHINGTON DEP AT FIRST OPPORTUNITY OF OUR ACTIONS. SHORTLY THEREAFTER WE GAINED VISUAL ON SMALL TWIN WHICH PASSED OFF OUR L SIDE AND LOW. WASHINGTON DEP CLRED US TO CONTINUE CLB TO FL190. WE WERE AT 10700 FT STARTING DOWN WHEN WE RECEIVED THAT CLRNC. ATC WAS EXTREMELY BUSY AND CTLR WAS NOT PREPARED FOR OUR ACTIONS AS IT SEEMED TO TAKE HIM BY SURPRISE.

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.