22 Autoflight

Question 1

What are the differences between TOGA LOCK, THR LOCK, and LVR ASYM?

Answer 1

TOGA LOCK: When aircraft leaves alpha-floor condition. Remove by disconnecting autothrust.

THR LOCK: Thrust levers in CLB detent (or MCT in OEI) and with an involuntary disconnection (failure or A/THR pb on FCU pressed). Move thrust levels to regain control.

LVR ASYM: Only with two engines, when one thrust level is in CLB or MCT/FLX and the other is not.

Question 2

What is the alpha lock function?

Answer 2

Inhibits slat retraction at high AOA (above 8.5 degrees) or low speed (below 148 knots).

Slats retract to 0 below 7.6 degrees AOA and speed greater than 154 knots.

Question 3

When does the autoland warning light illuminate? (8)

Answer 3

• at least one RA indicates a height below 200 ft
• at least one AP is engaged with LAND or FLARE on FMA
• at least one of the following:
• LOC deviation exceeds 1/4 dot and aircraft is above 15 ft RA
• GLIDE deviation exceeds 1 dot and the aircraft is above 100 ft RA
• loss of LOC above 15 ft RA
• loss of GLIDE above 100 ft RA
• difference between RAs over 15 ft
• last AP disengages
• FMGS detects long flare
• FMGS detects untimely flare