Quiz 5 APU/Fire Protection Flashcards
what does the APU provide
DC electrical power
environmental bleed air
both in-ground and in flight
Was the Hawker made with the APU
no it was added later via a supplemental-type certificate
(found in the supplement section of the AFM
The APU starter/generator power the aircraft electrical system via
PS2
Where does the APU get its fuel from
The left tank through the APU fuel shutoff valve
What does the stop button on the APU panel do
initiates shut-down of the APU - this button is used to shut down the APU during all normal operation
when will the automatic ECU shutdown of the APU occur in flight or on the ground
APU fire
low oil temperature
high oil pressure
DC power interruption of the ECU
Overcurrent to the ECU
loss of EGT signal
High EGT - above red line
overspeed - in excess fo 110%
loss of speed signal
Do we monitor the APU? Why?
no - it is self-monitoring to reduce pilot workload
Starter Generator when run by APU
as generator it powers the PS2 and PE - will power PS1 if bus tie is closed
APU emergency shutoff is located in the
rear equipment bay
(limitation) maximum rpm for APU
110%
(limitation) Maximum EGT for APU
1350F
(limitation) maximum transient EGT
14000F to 15000F for 15 seconds
(limitation) what pressure altitude can you not run the APU after
30,000
(limitation) what pressure altitude can you not start the APU after
20,000
(limitation) when will you shut down the APU if the ready to load light is not illuminated
within 60 seconds
(limitation) starter limits for APU
1st and 2nd attempt - 30 second on, 3 minutes off
3rd attempt - 30 seconds on 30 minutes off
(limitation) when should you not attempt a restart
both main generators have failed
(limitation) When is APU start prohibited
the left engine has been shut down due to fire or engine failure
automatic shut down has occured
(limitation) max generator load
.8
(limitation) maximum transient generator load
1.2 for less than 10 seconds
(limitation) limit for simultaneous operation of the APU and engine bleed are
1 minute
(limitation) can the APU be on for icing or anti-icing conditions
NO
(limitation) if passengers are on board the aircraft and the APU is on what must also be done
A crew member must be on the aircraft
(limitation) what are the rules for refueling and APU
can not be started during a refueling operation
if on during refueling must be refueled by single-point pressure refueling
what are the limitations to bleed air
123
1 minute with the main air valves and APU bleed operations running simultaneously
2 minutes run with no load before placing bleed air load on the APU
3 minutes in between start attempts
how many indications do we get when there is a fire
6 or 7
when would we get 7 fire indications instead of 6
if engine instruments are on the copilot’s PFD instead of PIC. If it is on PIC it will be 6 indications
What is a fire (or overheat) detected by
fire/overheat responders connected to continuous wire sensor
the sensor wire is filled with gas that expands when heated
What are the indications of an engine fire
ENG1/2 FIRE look up annunciators
ENG FIRE annunciator on the fire panel
master warning lights
HP Cock warning light
warning bell
What is our fire extinguisher and where are they located
two dual-head, single shot bottles located aft equipment bay
what is each fire extinguisher capable of
it is capable of discharging its total contents into zone one of either engine
both bottles can be discharged into either engine or both in the same engine
What is shot 1 (fire extinguisher 1)circuit powered by
PE
What si Shot 2 (fire extinguisher 2) circuit powered by
PS2
What are the fire warning circuits powered by
PE
the 2 sensing elements, 2 responders, 2 zones
these tell us something is HOT not that there is a FIRE
where are the pressure relief indicators located
under left pylon
when will the APU bottle automatically discharge
5 seconds after APU auto-shutdown due to overheat
