ATA 70- Engines

Question 1

How many LP stages compressor and turbine ?

Answer 1

4 LP compressors and 4 LP turbines

Question 2

How many HP compressor and turbine stages ?

Answer 2

9 HP compressor stages and 1 HP turbine

Question 3

What systems are driven by the Accessory gear box ?

Answer 3

IDG
FADEC alternator
Hydraulic pump
Fuel pumps
Oil pump
Pneumatic starter

Question 4

How many channels for a FADEC ? How many FADEC ?

Answer 4

2 FADEC, 1 per engine.
2 channels (1 active and 1 standby) per FADEC

Question 5

What main functions are provided by FADEC ?

Answer 5

Auto start
EGT protection at start
N1/N2 protection
Max thrust settings
ATHR and manual thrust
IDLE adjustment
Reverse sequencing
Parameters display

Question 6

What are the 3 IDLE possible ? What are their characteristics ?

Answer 6

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

Question 7

Description of the fuel system between LP valve and fuel nozzles ?

Answer 7

Cf diagram

Question 8

What device provides direct closure of the HP and LP SHUT-OFF VALVE ?

Answer 8

ENG MASTER

Question 9

What is the minimum starting oil temperature for engines ?

Answer 9

-40°C

Question 10

What is the maximun starter operating time ?

Answer 10

2 min followed by 20s cooling

Question 11

The FADEC automatically select continuous ignition in which following cases ?

Answer 11

Engine start, ignition is lagging
Engine flame out detected

Question 12

The max continuous engine OIL TEMP limit may be exceeded. What is the limit and for how much time ?

Answer 12

155°C for 15 min

Question 13

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 ?

Answer 13

True

Question 14

The FADEC is electrically supplied by what ?

Answer 14

Own alternator when N2 > 58%

Question 15

During an automatic START-UP sequence,when the PACK VALVE close ?

Answer 15

At IGN/START

Question 16

Dry cranking may be manually selected by setting which pb ?

Answer 16

MASTER SWITCH to OFF, ENG MODE SELECTOR to CRANK and MAN START P/B to ON

Question 17

How much time before initiating take-off do you have to start the last engine ? And why ?

Answer 17

2 min to avoid thermal shock and to let the center tank pumps complete self test. Taking off with center tank is prohibited

Question 18

When is MAN START (supp proc) recommended over auto start ?

Answer 18

• 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

Question 19

What is the only reason FADEC will abort automatically a manual start ?

Answer 19

In case of EGT exceedance

Question 20

The FADEC will not abort an auto start in case thrust levers are not at idle. True or false ?

Answer 20

False

Question 21

After an aborted auto start, FADEC performs automatically a dry crank if ENG masters are not selected off. True or false ?

Answer 21

True