POH section 7 Flashcards
what kind of construction is the fuselage?
semi-moncocque
what is the wing made of?
integrally machined wet box spar
conventional leading edge
reinforced fibreglass trailing edge
what are the horizontal and vertical stabilisers made of?
conventional aluminium construction with the he rudder and elevator covered in synthetic fabric
what is the leading edge of the vertical stabiliser made of?
reinforced SFK/CFK-hybrid
what does the retractable tricycle landing gear use?
oleo pneumatic shock struts
how is the master caution light cancelled and the system rearmed?
pressing the master caution button
what is the annunictaor system powered by?
28V DC
what is the annunciator system protected by?
WARN PANEL 1= ESS BUS on the the overhead circuit breaker panel
WARN PANEL 2= BUS 1 on the overhead circuit breaker panel
what do the pitot static instruments operate from?
2 independent pitot-static systems for the pilot and co-pilot
what type of ASI does the DO228 have?
conventional pressure sensitive capsule type
what is the max speed indicated on the ASI?
300 Knots
when will the red Vmo light annunciate?
when airspeed exceeds Vmo by up to 6 knots
what does the maximum allowable airspeed indicator (MAAS) provide if installed?
airspeed, max allowable airspeed, and overspeed warnings
what speed range is the MAAS calibrated in?
40-260 knots
what does the MAA pointer remain at up too 15000ft?
apron 200ias
what does the MAA pointer do from 15000-25000ft
gradually reduces the max airspeed from 200ias to 165ias
what powers the MAAS?
28V DC
what protects the MAAS?
STALL WARNING/ESS BUS on the AC/DC circuit breaker panel
what operates the VSI?
static pressure system
what is the range of the VSI?
4000fpm either side with 100 increments up to 2000fpm
what can indicate a near failure condition of the turn and slip?
an abnormal noise on shutdown
what do the 2 scale markings on the turn and slip stand for?
1.3 degrees/sec and 3 degrees/sec
what is the turn and slip indicator?
a rate gyro that indicates rate of turn along with slip/skid
what is the only thing that causes error in the slip/skid ball?
if an indicator is not level in the instrument panel
what powers the turn and slip?
28V DC
what protects the turn and slip?
left hand= BUS 1 on the overhead breaker panel
right hand= BUS 2 on the AC/DC breaker panel (if installed)
what operates the altimeter-encoder indicator?
static pressure from either pitot-static system
what powers the altimeter-encoder indicator?
28V DC
what protects the altimeter encoder indicator?
left hand= BUS 1 on the overhead panel
right hand= BUS 2 on the AC/DC breaker panel
what is altitude reporting in mode C based on?
1013hpa
how is altitude reported in mode C?
an encoded altitude signal is processed to the transponder for transmission to the interrogator ATC station
what range does the altimeter encoder operate in?
-1000 to 35000ft
when will the black and white striped section on the altimeter-encoder start to disappear?
10,000ft to disappear at 16,000ft
what happens on the altimeter encoder when below 0 feet?
the striped area becomes red and white and the altimeter starts to read backwards from 10,000ft (e.g. -10 ft= 9990 indicated)
what does the optionally installed GH 14-330 attitude indicator do?
supplies pitch and roll outputs to an optional weather radar to stabilise the antenna
what is the attitude indicator powered by?
26V AC (400Hz)
what is the attitude indicator protected by?
left hand and right hand= 26V BUS on AC/DC circuit breaker panel
what are the freedoms of pitch and roll on the AI?
+/-80 degrees in pitch
360 degrees in roll
what comes into view when the internal monitoring system senses an AI malfunction?
GYRO warning flag- in this case the attitude display is unreliable
what powers the HSI?
26V AC (400Hz)
what powers the HSI?
both powered by the 26V bus on the AC/DC circuit breaker panel
what drives the lateral deviation indicator on the HSI?
NAV reciever
what does 1 dot in azimuth indicate on the HSI?
0.5 degrees of localiser deviation
2 degrees of VOR deviation
what drives the glide slope deviation indicator on the HSI?
glide slope reciever
what does 1 dot in glideslpe deflection indicate on the HSI?
0.35 degrees glideslope deviation
what drives the TO/FROM indicator?
NAV reciever
what happens on the HSI if we have an invalid VOR signal?
TO/FROM indicator is moved out of view
where do the 2 pilots HSI’s recieve info from?
pilot= VHF NAV 1
co-pilot= VHF NAV 2
what does the Directional gyro system consist of?
KSG 105 slaved DG
processes signals from
KMT 112 magnetic azimuth transmitter
KA51 slaving unit
what does the DG system give heading data to?
- heading indicators
- autopilot
- flight directors
what does the KMT 112 magnetic azimuth transmitter do?
senses the direction of the earths magnetic field and transmits this info to the slaved DG
what powers the slaved directional gyros?
115V AC (400Hz)
what protects the slaved directional gyros?
115V BUS on the AC/DC circuit breaker panel
when power is first applied to the slaved DG system and slaved gyro mode is selected, where is the heading shown derived from?
magnetic azimuth transmitter
what does ‘free gyro’ mode do?
disengages the magnetic slaving loop on the DG and allows the heading indication to be manually positioned
what will failure detection circuitry in the Slaved DG activate if there’s a fault?
compass warning annunciator
what action should we take during ground ops to prevent damage to the slaved DG?
pull the appropriate circuit breaker during ground ops if the system is not needed
plane should not be moved within 15 minutes after electrical powered has been removed
what powers the light on the standby magnetic compass?
28V DC
what protects the light on the standby magnetic compass?
INSTR LTS/ BUS 1 on the AC/DC circuit breaker
what is the range of indication on the OAT indicator?
-50 to +50
where is the OAT sensor?
on the skin behind the nose wheel well
where is the flying hours counter?
right hand avionics rack
what starts the flying hours counter?
microswitch on the nose gear closes and completes a circuit once gear is retracted
what powers the flying hours counter?
28V DC
what protects the flying hours counter?
LDG WARN/ ESS BUS on the overhead breaker panel
AH METER/ESS BUS on the right hand avionics rack
what are the conventional controls operated by?
dual interconnected set of control wheels and rudder pedals which are also used to operate the nose wheel steering/wheel brakes
how is the stabiliser and aileron trim operated?
electrically operated by 3 position switches
how is the rudder trim operated?
mechanically (cables) operated by a hand crank
what is aileron deflection while in the neutral position?
4 degrees down
what is max aileron deflection from the neutral position?
25 degrees up 18 degrees down
what happens to the ailerons when the flaps are extended?
the ailerons are drooped automatically but maintain their full deflection range to optimise slow speed control
what controls the electromechanical aileron trim actuator?
3 position toggle switch with a spring loaded centre position situated on the pedestal panel which is attached to the artificial feel springs
how is the aeroplane trimmed using aileron trim?
the neutral position of the artificial feel springs is changed to reposition the aileron control
what powers the aileron trim?
28V Dc
what protects the aileron trim?
AIL TRIM/ESS BUS on the overhead circuit panel
what is the range of elevator deflection?
30 degrees up and 25 degrees down?
how are the elevators controlled?
mechanically by push pull rods (on the 228-200 series a spring attached to the push pull rods, acts to exert a slight push down force)
what positions the horizontal stabiliser when the trim is operated?
an electro-mechanical trim actuator (or dual trim actuator optionally)
what does the mechanical clutch on the stab trim protect against?
overload when the control wheel force exceeds approx. 50 daN in the direction of desired trim under 1g conditions
- 8 nose up and 1.6 nose down in turning flight
- 5 nose up and 3.4 nose down in turning flight with trim coupling installed
explain what the trim coupling system does
the stabiliser trim actuator is coupled to the flap drive mechanism by a flexible shaft which changes the position of the stabiliser and automatically compensates for changes in pitch trim due to the selection of flap
what annunciation will we get if the trim coupling systems flexible shaft breaks or does not rotate when the flaps are moving?
an amber SHAFT FL-TR light on the caution and warning panel
what annunciation will we get if the trim actuator limit switch operates incorrectly?
an amber LIMIT SWITCH caution light
what will we see on the annunciator panel with regard to the trim coupling system when power is first applied to the airplane?
SHAFT FL-TR caution light for approx 4 seconds
what will happen if the co pilot and pilot operate their trim switches in opposite directions simultaneously?
the trim motor will stop
what may incorrect trim settings result in?
high stick forces
how is the horizontal stabiliser trim system designed?
fail passive- a single electrical failure in the system may render the system inoperative, but no single electrical failure in any part of the system will cause a runaway of the actuator