Testing of propellers, Other Engineering

Assignment Help:

Testing After Install

After installation of a propeller, the engine must be ground run in order to check the propeller for correct function and operation.  Aircraft propeller installations vary considerably, and no set testing procedure would be satisfactory for all aircraft.  It is imperative, therefore, that any particular installation should be tested in accordance with the approved AMM procedure, which will normally include the following general requirements:

  • The engine should normally be fully cowled, and the aircraft should be facing into wind before starting an engine run. It is sometimes recommended that the pitch change cylinder should be primed with oil before starting, by operation of the feathering pump.
  • The safety precautions appropriate to engine ground running should be taken, the controls should be set as required, and the engine should be started.
  • As soon as the engine is operating satisfactorily, and before using high power, the propeller should be exercised in the manner specified in the Maintenance Manual, to establish that the pitch change mechanism is operating.
  • The checks specified in the Maintenance Manual to confirm satisfactory operation of the propeller system, including constant speed operation, feathering, operation of the propeller pitch change throughout its range, synchronisation with other propellers on the aircraft, and operation of associated warning and indicating systems, should be carried out.
  • Engine running time should be kept to a minimum consistent with satisfactory completion of the checks, and a careful watch should be kept on engine temperatures to avoid overheating. With turbine engines, changes to operating conditions should be carried out slowly, to avoid rapid engine temperature changes, and to conserve engine life.
  • When all checks have been successfully carried out, the engine should be stopped, and a thorough inspection of all propeller system components should be carried out, checking for security, chafing of pipes and cables, and signs of oil leaks.
  • Don't forget to complete all paperwork related to the maintenance activity, including Duplicate Inspections.

Note:  If vibration was experienced during the engine run, the hub retaining nut should be re-tightened after the engine shaft has cooled down. 


Related Discussions:- Testing of propellers

Effect of precipitate particles in strengthening, Q. Discuss the role of pr...

Q. Discuss the role of precipitate particles, strengthening crystalline materials against yield as low as well as high temperature of deformation. Ans. Effect of precipitate p

Thrust indication - aircraft engine, Thrust indication: Although rpm ga...

Thrust indication: Although rpm gauges give an indication of the rotational speed of the compressor, they do have one drawback. They do not normally indicate the thrust output

Java , why we need EJB

why we need EJB

Shell-mould casting, Shell-mould Casting is variant of the resin bonded sa...

Shell-mould Casting is variant of the resin bonded sand technique for casting steel, iron or non-ferrous alloys. The mould is made by a mixture of fine sand (100 - 150 mesh) an

Finance derivative, What are the no-arbitrage lower bound, and the no-arbit...

What are the no-arbitrage lower bound, and the no-arbitrage upper bound, of the vertical spread c(k1)-c(k2)?

Metallurgy engg., why practical engineering materials are homogeneous and i...

why practical engineering materials are homogeneous and isotropic?

Compressor stall and surge of aircraft, Compressor stall and surge: ‘Su...

Compressor stall and surge: ‘Surge' can occur in both centrifugal and axial flow compressors and is the reversal of the airflow in the compressor. It is a very undesirable con

Gravity, whats the gravitational force?

whats the gravitational force?

#LED MOVING DISPLAY, want a circuit manual of previous led moving dispaly

want a circuit manual of previous led moving dispaly

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd