A B777 captain is advised by his first officer that a 185 kt speed limit (in a turn) may have been e...

Attributes
ACN	1291333
Time
Date	201508
Local Time Of Day	1201-1800
Place
Locale Reference	EGLL.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Unstabilized Approach Inflight Event / Encounter Weather / Turbulence

Narrative:

Egll runway 27R; stable approach to 250 feet AGL. Due wind gusts: at 250 feet AGL a loss of 8 kts airspeed with corresponding pitch attitude change. Auto-throttle engaged and system unable to rapidly correct deteriorating airspeed. Aiding the auto-throttle system; I initially manually applied considerable power. Subsequent total loss of 12 - 14 kts at 150 feet AGL. Pushed throttles up to toga and pressed toga switch. Preformed successful manual go-around followed by auto-pilot engaged at 900 feet AGL. Engaged LNAV and VNAV.missed approach procedures: first officer advised me that a 185 kt speed limit (in a turn) may have been exceeded. I am unaware of speed exceedance during the 'turning portion' of this missed approach. Accelerated to clean maneuver speed during straight (non-turning) portion of this event. I could not find the initial (185kts) missed approach turning speed assignment on egll chart 11-4. This event bordered on low level windshear.

Original NASA ASRS Text

Title: A B777 Captain is advised by his First Officer that a 185 kt speed limit (in a turn) may have been exceeded during a missed approach at EGLL due windshear. This limit cannot be found anywhere on the 11-4 Approach chart.

Narrative: EGLL RWY 27R; stable approach to 250 feet AGL. Due wind gusts: at 250 feet AGL a loss of 8 kts airspeed with corresponding pitch attitude change. Auto-throttle engaged and system unable to rapidly correct deteriorating airspeed. Aiding the Auto-throttle system; I initially manually applied considerable power. Subsequent total loss of 12 - 14 kts at 150 feet AGL. Pushed throttles up to TOGA and pressed TOGA switch. Preformed successful manual go-around followed by auto-pilot engaged at 900 feet AGL. Engaged LNAV and VNAV.Missed approach procedures: First Officer advised me that a 185 kt speed limit (in a turn) may have been exceeded. I am unaware of speed exceedance during the 'turning portion' of this missed approach. Accelerated to clean maneuver speed during straight (non-turning) portion of this event. I could not find the initial (185kts) missed approach turning speed assignment on EGLL chart 11-4. This event bordered on Low Level windshear.

Data retrieved from NASA's ASRS site 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.

A B777 captain is advised by his first officer that a 185 kt speed limit (in a turn) may have been exceeded during a missed approach at egll due windshear. This limit cannot be found anywhere on the 11-4 approach chart.