61A Propeller Construction
TTP B1-L3 ATA 61A Beech 90 Series B2-L1 Propeller Construction The propellers on C90A/SE aircraft are Ha r tzell three- b laded propellers of the steel hub design that require periodic lubrication. The propellers on the C90B aircraft through LJ-1541 are McCaul e y™ fou r - b laded propellers that require no periodic lubrication. The propellers on the C90B/GT/G T i aircraft from LJ-1542 are Ha r tzell fou r - b lade propellers of the split/aluminum hub design that require periodic lubrication. All the propellers are constant spee d , full feathering, and r e v ersi b le. No r mal prop operating b lade angle ranges are flight (+85.8° to +12°), beta (+12° to +3°), and r e v erse (+3° to –10°) ( b lade angles g i v en are for the fou r - b laded Ha r tzell propellers) . The propeller contr...