Shola Posted October 27, 2018 Share Posted October 27, 2018 Please i need help. #2 Engine failed to air-start. Engine wound down from 60 percent rpm. On landing, engine started normally. NTS switch and NTS brackets checked ok. Pump housing oil quantity normal. Need help to rectify the fault. Thanks. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 Plz chek NTS system functioning SATISFICTORY.... chek NTS bracket gap from both plungers... Regards Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 What were the perameters at the time of unwinding of rpm??? Quote Link to comment Share on other sites More sharing options...
Shola Posted October 27, 2018 Author Share Posted October 27, 2018 60% rpm. Suddenly, engine wound down with all other parameters following. Remember that after landing, engine started normally Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 27, 2018 Share Posted October 27, 2018 58 minutes ago, Shola said: Please i need help. #2 Engine failed to air-start. Engine wound down from 60 percent rpm. On landing, engine started normally. NTS switch and NTS brackets checked ok. Pump housing oil quantity normal. Need help to rectify the fault. Thanks. Can U tells us about parameters when engine rewind, fuel flow , TIT .? Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 25 minutes ago, Shola said: 60% rpm. Suddenly, engine wound down with all other parameters following. Remember that after landing, engine started normally Dear when engine started unwinding at 60%rpm...at that time what was fuel flow.. Tit..and torque?? Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 7 minutes ago, Moeed hassan said: Dear when engine started unwinding at 60%rpm...at that time what was fuel flow.. Tit..and torque?? Plz conform your fuel enrichmnt system by performing ground run with enrichmnt ON.... is the enrichmnt go OFF or not???? Quote Link to comment Share on other sites More sharing options...
Awolola Posted October 27, 2018 Share Posted October 27, 2018 41 minutes ago, Ahmer said: Can U tells us about parameters when engine rewind, fuel flow , TIT .? All corresponding parameters such as TIT FF and oil pressures wound down as well Quote Link to comment Share on other sites More sharing options...
Awolola Posted October 27, 2018 Share Posted October 27, 2018 27 minutes ago, Moeed hassan said: Plz conform your fuel enrichmnt system by performing ground run with enrichmnt ON.... is the enrichmnt go OFF or not???? Enrichment worked fine as rapid increase in tit and fuel flow was observed during the air start Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 (edited) 1 minute ago, Awolola said: All corresponding parameters such as TIT FF and oil pressures wound down as well And what about FUEL ENRICHMENT??? Was that worked proper??? I means was fuel enrichmnt cut off or not??? Edited October 27, 2018 by Moeed hassan Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 27, 2018 Share Posted October 27, 2018 3 minutes ago, Awolola said: Enrichment worked fine as rapid increase in tit and fuel flow was observed during the air start What is TIT & fuel flow when rpm riwind? Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 3 minutes ago, Awolola said: Enrichment worked fine as rapid increase in tit and fuel flow was observed during the air start It seems that may b fuel enrichmnt was not cut off at 50psi pressure... Bcoz if it so then it may b the reason for flamout due to rich mixture... Thats y i asked for enrichmnt chek on groun run...it wil clear the situation. Quote Link to comment Share on other sites More sharing options...
Awolola Posted October 27, 2018 Share Posted October 27, 2018 4 minutes ago, Moeed hassan said: It seems that may b fuel enrichmnt was not cut off at 50psi pressure... Bcoz if it so then it may b the reason for flamout due to rich mixture... Thats y i asked for enrichmnt chek on groun run...it wil clear the situation. Thanks for the input. We would put that as well into consideration. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 27, 2018 Share Posted October 27, 2018 4 minutes ago, Awolola said: Thanks for the input. We would put that as well into consideration. Plz do inform what ever u find as result... Regards. Quote Link to comment Share on other sites More sharing options...
Awolola Posted October 27, 2018 Share Posted October 27, 2018 Trust will do thanks Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 27, 2018 Share Posted October 27, 2018 2 hours ago, Moeed hassan said: It seems that may b fuel enrichmnt was not cut off at 50psi pressure... Bcoz if it so then it may b the reason for flamout due to rich mixture... Thats y i asked for enrichmnt chek on groun run...it wil clear the situation. Moeed Hassan, u r right most probably chance is 50 psi pressure switch cause of flame out. Quote Link to comment Share on other sites More sharing options...
Shola Posted October 28, 2018 Author Share Posted October 28, 2018 18 hours ago, Ahmer said: Moeed Hassan, u r right most probably chance is 50 psi pressure switch cause of flame out. Hello We just completed the ground run. The fuel enrichment system worked ok. Engine rigging ok. Engine performed well during ground running. What else could likely be the problem? Thanks for your time. Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 28, 2018 Share Posted October 28, 2018 5 minutes ago, Shola said: Hello We just completed the ground run. The fuel enrichment system worked ok. Engine rigging ok. Engine performed well during ground running. What else could likely be the problem? Thanks for your time. Might be one time malfunction of s.s control. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted October 28, 2018 Share Posted October 28, 2018 On 10/27/2018 at 7:38 PM, Shola said: Please i need help. #2 Engine failed to air-start. Engine wound down from 60 percent rpm. On landing, engine started normally. NTS switch and NTS brackets checked ok. Pump housing oil quantity normal. Need help to rectify the fault. Thanks. See the ignitor plugs of the engine Munir Abbasi Quote Link to comment Share on other sites More sharing options...
Shola Posted October 29, 2018 Author Share Posted October 29, 2018 I know there is an air start switch in the valve housing. Could this be the cause of the engine failing to air start? Can anyone explain the function of the Air Start switch in the valve housing. Thanks. Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 29, 2018 Share Posted October 29, 2018 3 hours ago, Shola said: I know there is an air start switch in the valve housing. Could this be the cause of the engine failing to air start? Can anyone explain the function of the Air Start switch in the valve housing. Thanks. There is no air start switch in valve housing, condition lever air start position is is used during propeller hydraulic servicing , prop rigging on ground and air start the engine in air. The micro switch in condition lever actuate the prop aux pump motor when we select the condition lever to air start. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 29, 2018 Share Posted October 29, 2018 8 minutes ago, Ahmer said: There is no air start switch in valve housing, condition lever air start position is is used during propeller hydraulic servicing , prop rigging on ground and air start the engine in air. The micro switch in condition lever actuate the prop aux pump motor when we select the condition lever to air start. may b SHOLA is talking about AIR START CIRCUIT.... because air start switch is not in valve housing..... NOT SURE BUT MAY B THIS SWITCH IS AVAILABLE IN ELECTRONIC VALVE HOUSING.... Quote Link to comment Share on other sites More sharing options...
Shola Posted October 29, 2018 Author Share Posted October 29, 2018 46 minutes ago, Ahmer said: There is no air start switch in valve housing, condition lever air start position is is used during propeller hydraulic servicing , prop rigging on ground and air start the engine in air. The micro switch in condition lever actuate the prop aux pump motor when we select the condition lever to air start. Thank you very much. I saw a diagram of the valve housing showing air start switch. Hence, my curiosity. Quote Link to comment Share on other sites More sharing options...
Shola Posted October 29, 2018 Author Share Posted October 29, 2018 38 minutes ago, Moeed hassan said: may b SHOLA is talking about AIR START CIRCUIT.... because air start switch is not in valve housing..... NOT SURE BUT MAY B THIS SWITCH IS AVAILABLE IN ELECTRONIC VALVE HOUSING.... Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 29, 2018 Share Posted October 29, 2018 51 minutes ago, Shola said: Quote Link to comment Share on other sites More sharing options...
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