Emergency command authority/authorized used by PIC of B757 for unauthorized uncoord descent procedur...

Attributes
ACN	357913
Time
Date	199701
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ogg
State Reference	HI
Altitude	msl bound lower : 28500 msl bound upper : 35000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other other
Route In Use	enroute : other oceanic enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	357913
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

En route lax-ogg, XA50Z, wbound track D 90E danka, FL350, mach .79. Flight encroached area of moderate chop with no significant radar returns. Seat belt sign illuminated with announcement. Requested descent to FL290. Hnl radio advised 'standby.' chop rapidly intensified to light to moderate turbulence with occasional severe jolts. Flight attendants ordered to be seated. Made second request for immediate descent FL280. Hnl radio advised, 'no answer from ATC, rexmitting, standby.' FL350 uninhabitable. Initiated oceanic emergency WX deviation procedures. Displaced laterally from track, then initiated descent towards FL285. Transmitted pan- pan-pan and intentions on HF and VHF guard. TCASII indicated no conflicting targets. Received ATC clearance to FL290. Received amended ATC clearance to FL270 due other descending traffic. Cleared to rejoin track D at duffee FL270. Requested hnl radio relay turbulence report to dfw dispatch. No passenger or flight attendant injuries reported from cabin. No indication of equipment damage. E6 entry and maintenance notified. Flight continued and landed ogg without further incident.

Original NASA ASRS Text

Title: EMER COMMAND AUTH USED BY PIC OF B757 FOR UNAUTH UNCOORD DSCNT PROC AFTER AN INFLT ENCOUNTER WITH SEVERE CLR AIR TURB.

Narrative: ENRTE LAX-OGG, XA50Z, WBOUND TRACK D 90E DANKA, FL350, MACH .79. FLT ENCROACHED AREA OF MODERATE CHOP WITH NO SIGNIFICANT RADAR RETURNS. SEAT BELT SIGN ILLUMINATED WITH ANNOUNCEMENT. REQUESTED DSCNT TO FL290. HNL RADIO ADVISED 'STANDBY.' CHOP RAPIDLY INTENSIFIED TO LIGHT TO MODERATE TURB WITH OCCASIONAL SEVERE JOLTS. FLT ATTENDANTS ORDERED TO BE SEATED. MADE SECOND REQUEST FOR IMMEDIATE DSCNT FL280. HNL RADIO ADVISED, 'NO ANSWER FROM ATC, REXMITTING, STANDBY.' FL350 UNINHABITABLE. INITIATED OCEANIC EMER WX DEV PROCS. DISPLACED LATERALLY FROM TRACK, THEN INITIATED DSCNT TOWARDS FL285. XMITTED PAN- PAN-PAN AND INTENTIONS ON HF AND VHF GUARD. TCASII INDICATED NO CONFLICTING TARGETS. RECEIVED ATC CLRNC TO FL290. RECEIVED AMENDED ATC CLRNC TO FL270 DUE OTHER DSNDING TFC. CLRED TO REJOIN TRACK D AT DUFFEE FL270. REQUESTED HNL RADIO RELAY TURB RPT TO DFW DISPATCH. NO PAX OR FLT ATTENDANT INJURIES RPTED FROM CABIN. NO INDICATION OF EQUIP DAMAGE. E6 ENTRY AND MAINT NOTIFIED. FLT CONTINUED AND LANDED OGG WITHOUT FURTHER INCIDENT.

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.

Emergency command authority/authorized used by PIC of B757 for unauthorized uncoord descent procedure after an in-flight encounter with severe clear air turbulence.