Secondary Flight Controls Flashcards
How many trailing edge flaps
Two
Inboard and outboard
How many leading edge slats
Seven
One inboard
Six outboard
What is the Krueger flap purpose
seal between inboard slats and engine nacelle
When are flaps inhibited
Above 20,000ft or greater than 275 knots
What EICAS displays when flap handle is out of UP when flaps are inhibited
LOAD RELEIF
What happens when flaps are selected to the ONE position
Slats move to the mid range postion
When will slats move to the full position
Flap position 25 or more
When slats are commanded to any position they move after flap movement
FALSE
Modes of operation for secondary controls
Primary, Secondary, Alternate
What modes do flaps operate independent of slats
Primary and Secondary
How are flaps actuated in the PRIMARY mode
Center Hydraulic system
How are flaps actuated in the Secondary and Alternate modes
Electrically from the left and right AC buses
How is secondary mode selected
Automatically
How is alternate mode selected
Alternate flaps ARM switch
In secondary mode are slats extended to the mid position
No, unless airspeed exceeds 256kts.
When is flap extension and retraction in the secondary mode inhibited
- Less than 40kts
- Center hydraulic system pressure is low
two of the following are true - Left engine N2 less than 50%
- Right engine N2 less than 50%
- Primary external power is available
How do flaps and slats extend in the alternate mode
Simultaneously
How do flaps and slats retract in the alternate mode
Slats inhibited until flaps are up
Maximum flap and slat extension in alternate mode
Mid range slats and 20 flap
What flap positions allow load relief
15 through 30 in primary only
When are auto slats available
1 through 20 (Anytime slats are in the mid position)
What is the purpose of auto slats
Improve stall characteristics by extending to the full position.
