Pre­vent­ing Gipsy Ma­jor en­gine fail­ures

Pilot - - NOTES -

The CAA says that it has ‘iden­ti­fied in­for­ma­tion’ that sug­gests the use of Av­gas 100LL fuel in de Hav­il­land Gipsy ma­jor en­gines could cause re­li­a­bil­ity prob­lems, par­tic­u­larly with cylin­der heads, valves and valve seats, es­pe­cially where bronze cylin­der heads have not been mod­i­fied to in­cor­po­rate stain­less steel valve seats, and th­ese could re­sult in a re­duc­tion of com­po­nent life.

‘UL91 is the most ap­pro­pri­ate fuel to be used by your Gipsy Ma­jor en­gine. Av­gas 100LL can be used, but this may af­fect the longevity of the com­po­nents. Un­leaded mo­gas should not be used due to it con­tain­ing oc­tane en­hancers, no­tably ethanol, which can cause dam­age to your en­gine, par­tic­u­larly non­metal­lic com­po­nents in­clud­ing the car­bu­ret­tor floats, rub­ber pipework, seals etc.’

It adds that ‘whilst the CAA recog­nises that a rough run­ning en­gine or en­gine fail­ure can be caused by a mul­ti­tude of fac­tors, one re­me­dial ac­tion is to en­sure the most ap­pro­pri­ate fuel is used where avail­able and that the en­gine is reg­u­larly checked by a qual­i­fied en­gi­neer’ and rec­om­mends that all op­er­a­tors of air­craft pow­ered by Gipsy Ma­jor en­gines (whether on Na­tional Cer­tifi­cate of Air­wor­thi­ness or Per­mit to Fly) en­sure that rou­tine checks on the en­gines are car­ried out by a com­pany/per­son ex­pe­ri­enced on this en­gine type.

‘To en­sure the en­gines are in a good and ser­vice­able con­di­tion you should also have your en­gine prop­erly checked if the en­gine is found to be run­ning rough, or low com­pres­sion is no­ticed when turn­ing the pro­pel­ler by hand,’ it ad­vises.

UL91 is the most ap­pro­pri­ate fuel for Gipsy Ma­jors says the CAA

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