A321N PW1000GTF Start Sequence
Thread Starter
Joined: May 2024
Posts: 5
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From: Spain
A321N PW1000GTF Start Sequence
Hello guys,
I will start my A320 type rating in about 2 months. I've been studying from a CBT for a good while to get some knowledge about the systems, and I'm really curious about how the engine start sequence looks like.
For example, for the CFM56, as far as I'm aware:
Engine Master ON --> Starter Air valve opens and F Used resets --> At 16%N2 igniter (A or B energizes) --> 22% Fuel is delivered ... etc etc
How would this sequence look like for the PW1000GTF? If you could enlighten me I would highly appreciate it. Thank you.
Best regards!
I will start my A320 type rating in about 2 months. I've been studying from a CBT for a good while to get some knowledge about the systems, and I'm really curious about how the engine start sequence looks like.
For example, for the CFM56, as far as I'm aware:
Engine Master ON --> Starter Air valve opens and F Used resets --> At 16%N2 igniter (A or B energizes) --> 22% Fuel is delivered ... etc etc
How would this sequence look like for the PW1000GTF? If you could enlighten me I would highly appreciate it. Thank you.
Best regards!
Joined: Jul 2006
Posts: 1,100
Likes: 111
From: Somewhere over the rainbow
Hello,
ENG MODE selector: IGN/START: If cooling is displayed on both engines and you have the dual cooling push button available, Then you press the Dual cooling push button.
Then ENG 2 Start: At about 18% Indication of Ignition A or B and Fuel Flow increases
20 seconds max after fuel is ON: EGT increases and N1 increases prior to 48% N2
At approximately 55% N2 : Start valve closed and Ignition OFF.
I would not worry too much about learning these values by heart; What is more important is to know the correct SOP related to engine start and especially for abnormal. Airbus is great and ECAM will tell you what to do in case something goes wrong except in 3 cases I can think of: N2 high vibration (VIB>5 on PW engines), LOSS of ECAM display, or tail pipe fire. In these cases you will have to shut down the engines by yourself. I had also a case where the starter motor had issues and sparks was coming out of the cowling and maintenance asked us to shut down the engine immediately. In 10 years + flying the Baby Bus, that's the only time I had to shut down the engine without ECAM. In the simulator I have a TRE who loves to give engine start with zero oil pressure and also no ECAM in that case. The oil pressure is also not monitored by ECAM but surely if no oil you will have other engine indications who will spike up...
One Mnemonic I found pretty useful which is valid for all jet engines during start: SNIFENOS: Start valve Open, N2 increasing, Ignition ON, Fuel Flow Increasing, EGT rising, N1 rising, Oil pressure rising and Start valve close.
Enjoy the Type rating!
ENG MODE selector: IGN/START: If cooling is displayed on both engines and you have the dual cooling push button available, Then you press the Dual cooling push button.
Then ENG 2 Start: At about 18% Indication of Ignition A or B and Fuel Flow increases
20 seconds max after fuel is ON: EGT increases and N1 increases prior to 48% N2
At approximately 55% N2 : Start valve closed and Ignition OFF.
I would not worry too much about learning these values by heart; What is more important is to know the correct SOP related to engine start and especially for abnormal. Airbus is great and ECAM will tell you what to do in case something goes wrong except in 3 cases I can think of: N2 high vibration (VIB>5 on PW engines), LOSS of ECAM display, or tail pipe fire. In these cases you will have to shut down the engines by yourself. I had also a case where the starter motor had issues and sparks was coming out of the cowling and maintenance asked us to shut down the engine immediately. In 10 years + flying the Baby Bus, that's the only time I had to shut down the engine without ECAM. In the simulator I have a TRE who loves to give engine start with zero oil pressure and also no ECAM in that case. The oil pressure is also not monitored by ECAM but surely if no oil you will have other engine indications who will spike up...
One Mnemonic I found pretty useful which is valid for all jet engines during start: SNIFENOS: Start valve Open, N2 increasing, Ignition ON, Fuel Flow Increasing, EGT rising, N1 rising, Oil pressure rising and Start valve close.
Enjoy the Type rating!
Joined: Nov 1999
Aviation Qualifications: ATPL
Posts: 3,150
Likes: 744
From: UK
Have been off the line for a couple of years, (boo hoo), do we not set the chronos to time the light up and starter running time any more ? - (to limit its engagement time in case of a non start).
Joined: Jul 2006
Posts: 1,100
Likes: 111
From: Somewhere over the rainbow
We stopped doing this in 2015. before that we used to do it for the IAE engines. Now only for manual start we use the timer to monitor the light-up duration. On the PW1000 engines we will get an ECAM :' Starter time Exceeded'' if the engine starter time limit is exceeded. The timing is still required for manual engine start tho same as for the IAE.
