Shola Posted October 16, 2018 Share Posted October 16, 2018 Please i need help. We recently encountered an uncommanded movement of the #4 engine throttle lever from ground idle to just before the gate of flight idle. We checked and confirmed that the cable tension is ok. We also cleaned and greased all bell-cranks. Yet, the problem persists. Once the throttle is moved from the ground idle, it creeps forward until it reaches the gate of flight idle. Any advise would be appreciated. Thanks. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted October 17, 2018 Share Posted October 17, 2018 check gimbal assembly - something is worn out Quote Link to comment Share on other sites More sharing options...
Shola Posted October 17, 2018 Author Share Posted October 17, 2018 2 hours ago, pjvr99 said: check gimbal assembly - something is worn out Thank you very much. We will install a new gimbal assembly this morning. I will let you know the outcome. Once more, thanks a million. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 17, 2018 Share Posted October 17, 2018 We have faced same problem once in the past and as pjvr99 said to check the gimble assy... I m sure problem would be there bcoz in over case which was same we finde accessive play in gimble assy... REGARDS. Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 18, 2018 Share Posted October 18, 2018 May be problem is with ur gamble or valve housing cover. Quote Link to comment Share on other sites More sharing options...
Shola Posted October 19, 2018 Author Share Posted October 19, 2018 Thank you all for your suggestions. Based on your advise, we replaced the gimbal assembly and carried out rigging of the propeller. The throttle lever creeping has stopped. Again, thanks for your time. Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 19, 2018 Share Posted October 19, 2018 Further more the problem in gamble the cables are not in proper places .u can check IPB & 76JG ( all 13 cable length with there actuall positon on gamble) u can measure and resolve gamble problem too. Quote Link to comment Share on other sites More sharing options...
Shola Posted October 19, 2018 Author Share Posted October 19, 2018 Gentlemen, I regret to inform you that after ground run of the engines, the creep came back. This is even after replacing the valve housing cover. Our next plan is to swap engine 1 and 4 to see if the problem will transfer. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 20, 2018 Share Posted October 20, 2018 Have u check the gemble pully cables length.... Plz ensure the pullyes cables are of proper length and part number... Moreover plz check clutch pully bearings for servicability.... Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 21, 2018 Share Posted October 21, 2018 May sound silly but have you checked the friction lock on the throttles? Quote Link to comment Share on other sites More sharing options...
Ahmer Posted October 21, 2018 Share Posted October 21, 2018 I think friction knob is used for all four throttle, but they have creeping only on no4 psn throttle not all ? Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 21, 2018 Share Posted October 21, 2018 7 minutes ago, NATOPS1 said: May sound silly but have you checked the friction lock on the throttles? May b but do u think friction lock is the problem??? Bcoz friction lock works for all throttles not for individual throttle lever.... So i dont think that friction lock would b the problem.... Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 21, 2018 Share Posted October 21, 2018 Just now, Moeed hassan said: May b but do u think friction lock is the problem??? Bcoz friction lock works for all throttles not for individual throttle lever.... So i dont think that friction lock would b the problem.... I think I would make sure before I task my maintenance with two engine changes. Quote Link to comment Share on other sites More sharing options...
Moeed hassan Posted October 21, 2018 Share Posted October 21, 2018 17 minutes ago, NATOPS1 said: I think I would make sure before I task my maintenance with two engine changes. Sound good.... Quote Link to comment Share on other sites More sharing options...
Shola Posted October 22, 2018 Author Share Posted October 22, 2018 On 10/21/2018 at 3:15 PM, NATOPS1 said: I think I would make sure before I task my maintenance with two engine changes. Hello NATOPS. Surprisingly, the throttle creeping has stopped after we swapped the engines. The aircraft has been scheduled to go for functional check flight. I will let you know the outcome of the FCF. Thanks. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted October 24, 2018 Share Posted October 24, 2018 Glad you are making progress and hope the FCF goes well!! Good work! Quote Link to comment Share on other sites More sharing options...
Farhanz Posted May 20 Share Posted May 20 On 10/23/2018 at 3:37 AM, Shola said: Hello NATOPS. Surprisingly, the throttle creeping has stopped after we swapped the engines. The aircraft has been scheduled to go for functional check flight. I will let you know the outcome of the FCF. Thanks. hello shola, could you please tell us the result? Quote Link to comment Share on other sites More sharing options...
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