PPRuNe Forums - View Single Post - BA A350 tail strike at LHR
View Single Post
Old 10th Jan 2022, 01:15
  #23 (permalink)  
stilton
 
Join Date: Apr 2004
Location: Planet Earth
Posts: 2,089
Likes: 0
Received 9 Likes on 8 Posts
Originally Posted by A4
Re Somotogravic Illusion….

A baulked landing from the flare DEMANDS and “appropriate” pitch attitude INITIALLY - typically <10° - due to the tailstike risk on a longer aircraft. The SOLE purpose of the manuouvre is to get the aircraft climbing again whilst minimising the risk of banging the tail. Once it’s evident that you’re safely away from terra firma (RA > 50’-80’) increase pitch to circa 15°/SRS and call “Go around flaps” to transition into the normal GA actions…because with TOGA and <10° pitch you’ll start to accelerate quite quickly. Rotation straight to 15° from the flare - particularly with engines still spooling from idle - would be “sub optimal” due to the initial low energy and high AoA. Maintaining and “appropriate pitch”, any sink should result in a brief touch and go…whereas 15° would result in a three pointer with the mains and tail……

One issue with a baulked landing / GA from the flare is the transition back out of FLARE mode (don’t know if A350 has this?) Single aisle Airbus wind on nose down trim during the flare to “force” the pilot to make an aft side stick input like on a “normal” aircraft. But if you then initiate a BL/GA, the aircraft can feel very nose heavy due to the trim input from FLARE mode…..give it a tug and…… bang. As you climb away the aircraft transitions back from FLARE mode to FLIGHT mode and the auto trim will wind the trim off again.

No doubt all come out in the report……easily done.

A4

The very unsophisticated (by todays standards) 757 and 767 would limit pitch attitude during the initial phases of an auto go around below a certain RA, forget what it is


If it was a manual GA flight director commands limited pitch attitude, in both of those scenarios the limiting was to avoid a tail strike
stilton is offline