ATA 70- Engines Flashcards
How many LP stages compressor and turbine ?
4 LP compressors and 4 LP turbines
How many HP compressor and turbine stages ?
9 HP compressor stages and 1 HP turbine
What systems are driven by the Accessory gear box ?
IDG
FADEC alternator
Hydraulic pump
Fuel pumps
Oil pump
Pneumatic starter
How many channels for a FADEC ? How many FADEC ?
2 FADEC, 1 per engine.
2 channels (1 active and 1 standby) per FADEC
What main functions are provided by FADEC ?
Auto start
EGT protection at start
N1/N2 protection
Max thrust settings
ATHR and manual thrust
IDLE adjustment
Reverse sequencing
Parameters display
What are the 3 IDLE possible ? What are their characteristics ?
Modulated: modulated according to Bleed demand and IDG temperature
Approach: selected when Slats/Flaps extended, higher regime in case of GA
Reverse: Higher than modulated
Description of the fuel system between LP valve and fuel nozzles ?
Cf diagram
What device provides direct closure of the HP and LP SHUT-OFF VALVE ?
ENG MASTER
What is the minimum starting oil temperature for engines ?
-40°C
What is the maximun starter operating time ?
2 min followed by 20s cooling
The FADEC automatically select continuous ignition in which following cases ?
Engine start, ignition is lagging
Engine flame out detected
The max continuous engine OIL TEMP limit may be exceeded. What is the limit and for how much time ?
155°C for 15 min
In flight, if the INSTINCTIVE DISCONNECT P/B on thrust levers is pressed for more than 15 sec, the A/THR including ALPHA FLOOR is definitively lost. True or False ?
True
The FADEC is electrically supplied by what ?
Own alternator when N2 > 58%
During an automatic START-UP sequence,when the PACK VALVE close ?
At IGN/START
Dry cranking may be manually selected by setting which pb ?
MASTER SWITCH to OFF, ENG MODE SELECTOR to CRANK and MAN START P/B to ON
How much time before initiating take-off do you have to start the last engine ? And why ?
2 min to avoid thermal shock and to let the center tank pumps complete self test. Taking off with center tank is prohibited
When is MAN START (supp proc) recommended over auto start ?
- After abort auto start (stall, EGT, low start air pressure)
- Hot temperatures or high altitude
- Intermittent ENG IGN FAULT at 1st start of the day
What is the only reason FADEC will abort automatically a manual start ?
In case of EGT exceedance
The FADEC will not abort an auto start in case thrust levers are not at idle. True or false ?
False
After an aborted auto start, FADEC performs automatically a dry crank if ENG masters are not selected off. True or false ?
True
