KV ERJ Engine Start (14)

Question 1

What are the considerations associated with a ground crew exceeding 5 knots during the pushback?

Answer 1

1) hydraulic system 1 or hydraulic system 2 is depressurized the auto brake automatically disarms
2) and EICAS messages BRK LH (RH) FAULT or FAIL will display.
2. a) message remains until either the wheel speed is less than 5 kts, or the hydraulic systems are re-pressurized.

(SOPM 4-3.2)

Question 2

What is required to generate a green light during pushback?

Answer 2

A Green Light is generated when:

1. Steering disengaged (External Switch)
2. Parking Brake not applied
3. Main brake not applied

(AOM V2 14-13-05.18)

Question 3

What will FADEC automatically abort for during engine starts on the ground?

Answer 3

1) hot,
2) hung starts,
3) and no light-off.

(AOM V2 14-06-30.9)

Question 4

What is the memory item associated for an engine abnormal start?

Answer 4

AFFECTED ENGINE:

START/STOP SELECTOR………………………..STOP

Question 5

What are the starter duty cycles on the ground?

Answer 5

1) Start #1-2: 90 seconds ON, 10 seconds OFF

2) Start #3-5: 90 seconds ON, 5 minutes OFF (2-4.2)

Question 6

What conditions would justify dry motoring an engine?

Answer 6

1) No light-off.
2) Excess fuel in combustion chamber.
3) Starting an engine at an airport where volcanic ash has fallen.

(AOM V1 3-75.32)

Question 7

Provide at least two considerations with respect to cold weather engine starts.

Answer 7

1) Ramp contamination (consider delaying start until pushback complete),
2) Freedom of N1 rotation,
3) Rapid increase in oil pressure,
4) IDGs may be slow to produce steady power.
(SOPM 4-3.8)

Question 8

Which engine do we normally start if we plan a single engine taxi? Why?

Answer 8

1) Engine 1 (SOPM 4-3.4)
2) due to hydraulic pump 2 AUTO logic. Inboard brakes and nose wheel steering is on hydraulic system 2.

(AOM V2 14-11-10.3)

Question 9

What is the minimum pressure required for a cross-bleed engine start? Where can this pressure be referenced?

Answer 9

1) 40-45 PSI. Pressure can be referenced on MFD STATUS synoptic page prior to engine start.
2) (SOPM 4-3.7) or
3) (AOM V1 3-70.1)

The minimum recommended bleed duct pressure prior to start is 40 PSI minus 0.5 PSI for every 1000 ft above sea level.
(DEN/COS ~ 37 PSI)

Question 10

How close does the actual N1 have to be to calculated value after engine start?

Answer 10

Actual N1 is not below and no more than 0.5% of the calculated value after second engine start. (SOPM 4-3.5)

Question 11

Does the FADEC provide start malfunction protection in flight?

Answer 11

No. During inflight starts, FADEC has NO protection for hot, hung, or failure to light off starts.
(AOM V2 14-06-20.2)

Question 12

What is the ITT start limitation?

Answer 12

815°C (SOPM 2-4.2)

Question 13

What thrust value wold be set by FADEC if an engine failed at V1?

Answer 13

TO-X RSV. “X” indicates TO mode used
(TO-1 RSV, TO-2 RSV).

(SOPM 4-7.18)(AOM V2 14-06-30.3)

Question 14

When are FLEX takeoffs prohibited?

Answer 14

Reduced thrust (FLEX) takeoffs are prohibited;

1) on contaminated runways,
2) reported or forecasted wind shear,
3) or when a special departure procedure specifies full thrust for takeoff. (SOPM 4-7.3)

Question 15

The engine start must be manually aborted when?

Answer 15

1) No oil pressure indication within 10 seconds after N2 starts to increase
2) No N1 rotation before (50% N2) Starter cutout - Typically Tailwind causes
3) No ITT indication within 30 seconds
4) ITT exceeds start limit 815 deg C
5) Oil pressure below engine limits - Red
6) N1 (N2) fail to accelerate to stable idle speed - FADEC will abort - technique is to allow the starter to rotate N1 until 90 secs total, before moving the selector switch to Stop.
7) Intermittent electric pneumatic or starter malfunction.