NATOPS - Flap/Slat and Speed Brake Systems Flashcards
Describe the flaps
Two double slotted trailing edge flaps, pivoted below the lower surface of the wing, and spanning from the fuselage root fairings to the ailerons.
Which hydraulic system actuates the flaps?
HYD 1
How many actuators are used in the flap system?
The flaps are raised and lowered by a single actuator via a series of push-pull control rods and bellcrank levers
What are the approximate flap extensions for 1/2 and DN positions
25 degrees for 1/2, 50 degrees for DN
What does the emergency flap extension system use to drive the flaps to full down?
Pressure from the wheel brake/emergency flap accumulator
What does placing the EMER FLAPS switch to the DOWN position accomplish?
A solenoid operated emergency valve directs pressure to the down line and activates a dump valve on the up line to fully extend the flaps. Slats are not operated via the EMER FLAPS switch.
How many slat segments are there?
Three on each wing
How are the slat drive actuators powered?
By HYD 1
What ensures the slat remains locked in the selected position?
Overcenter links attached to each main bell crank.
How are the slats operated?
Positioning the FLAPS/SLATS lever to either 1/2 or DOWN causes the slat selector valve to port hydraulic fluid to both lock actuators moving the over-center links from the lock position. At the same time hydraulic fluid is also ported to each slat actuator extending the slat assembly. Once the slat is fully extended the lock actuators reposition the overcenter link in the locked position.
At what airspeed will the slats extend?
Airspeed must be below 217 knots for the slats to extend
How are the speed brakes controlled?
By a three position speed brake switch, spring
loaded to center, located on the inboard side of the throttle grip.
What does the SP BRK advisory light indicate
The speed brakes are not fully retracted
At what airspeed will speed brakes blow back?
The speed brakes begin to blow back at an airspeed of approximately 380 knots and extend fully if the airspeed subsequently decreases to 340 knots
How are the speed brakes actuated?
Hydraulic fluid from the HYD 1 system passes through a slide valve and is directed to either the extend or retract sides of the speed brake actuators.
