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Flashcards in 737 Engine Starts Deck (6)
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1

[1/3] Engine start sequence: (engine start level)

• Starting #2 Eng first is required.
• Single engine taxi is required with APU running.

- Call "STARTING ENGINE NO. 1 (or 2).
- PACK switches - OFF.
- ENGINE START switch - GRD.
- Start Timing.
- Verify increase in N2 RPM.
- Position engine start lever to IDLE detent when:
• N1 rotation is observed and,
• N2 RPM reaches 25%, or (if 25% N2 is not possible), at maximum motoring and minimum of 20% N2.
[NOTE]: Maximum motoring occurs when N2 acceleration is less than 1% in approximately 5 seconds.

2

[2/3] Engine start sequence: (Starter cutout)

- Verify fuel flow and EGT indications.
- At 56% N2 RPM check ENGINE START switch moves to OFF; [if not, position start switch to OFF.]
- Verify START VALVE OPEN alert extinguishes as the ENGINE START switch moves OFF and call "STARTER CUTOUT."

3

[3/3] Engine start sequence: (After starter cutout)

- Monitor N1, N2, EGT, fuel flow and oil pressure for normal indications as the engine accelerates and stabilizes at idle.
- ISOLATION VALVE switch - CLOSE.
- Right PACK switch - AUTO.
- Duct Pressure - Stable.

4

Notes:

On a standard day at sea level, approximate stabilized idle indications are as follows:
• N1 - 20%
• N2 - 59%
• EGT - 410°C**
• Fuel Flow - 600 PPH
**Idle EGT may vary from 320°C - 520°C depending on OAT, bleed configuration, and engine conditions.

>Single Engine Taxi note: If there is an engine exhaust odor from the AC system, turn Left Pack OFF. (#2 Eng exhaust may be entering APU compressor).<

5

Starter Duty Cycle

• Do not exceed 2 minutes during each start attempt
• A minimum of 10 seconds is required between start attempts

6

Do the ABORTED ENGINE START when:

• The N1 or N2 does not increase or increase very slowly after the EGT increases
• There is no oil pressure indication by the time that the engine is stable at idle
• The EGT does not increase by 15 seconds after the engine start lever is moved to IDLE
• The EGT quickly nears or exceeds the start limit (725°C)