<< >> NASA ASRS Report 738718, May 2007

A B757 captain's request for a WX deviation was denied. The captain exercised emergency authority and was later told of conflicting traffic.

Attributes
ACN	738718
Time
Date	200705
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : zzz
State Reference	US
Altitude	msl single value : 33000
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : zzz.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	738718
Events
Anomaly	conflict : airborne less severe inflight encounter : weather non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : declared emergency none taken : detected after the fact
Supplementary
Problem Areas	Weather ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

Headed south on airway just south of ZZZ; a line of thunderstorms lay across the airway extending out to the west. We made a request to deviate left of course for WX avoidance via HF. Request was denied. The captain then relayed to commercial radio 'I am exercising my emergency authority/authorized to deviate left of course.' we deviated left and returned on course prior to ZZZ2. ATC later relayed that request was denied due to sbound traffic on opposing airway.

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Original NASA ASRS Text

Title: A B757 CAPT'S REQUEST FOR A WX DEVIATION WAS DENIED. THE CAPT EXERCISED EMERGENCY AUTHORITY AND WAS LATER TOLD OF CONFLICTING TFC.

Narrative: HEADED S ON AIRWAY JUST S OF ZZZ; A LINE OF TSTMS LAY ACROSS THE AIRWAY EXTENDING OUT TO THE W. WE MADE A REQUEST TO DEVIATE L OF COURSE FOR WX AVOIDANCE VIA HF. REQUEST WAS DENIED. THE CAPT THEN RELAYED TO COMMERCIAL RADIO 'I AM EXERCISING MY EMER AUTH TO DEVIATE L OF COURSE.' WE DEVIATED L AND RETURNED ON COURSE PRIOR TO ZZZ2. ATC LATER RELAYED THAT REQUEST WAS DENIED DUE TO SBOUND TFC ON OPPOSING AIRWAY.

Data retrieved from NASA's ASRS site as of January 2009 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.