Сильное дымление двигателя

Причины:

¾ неисправность отсечного клапана;

¾ нарушение уплотнения привода центробежного топливного насоса;

¾ неисправность маслоагрегата.

8.5. ОСОБЕННОСТИ ЭКСПЛУАТАЦИИ МАСЛОСИСТЕМЫ

Контроль работоспособности и технического состояния маслосистемы осуществляется при техническом обслуживании, предполетной подготовке и в процессе работы двигателя на земле и в полете. Особое внимание при эксплуатации маслосистемы экипаж вертолета должен обращать на: контроль заправки, осмотр двигателя перед запуском на предмет отсутствия подтекания масла, подогрев двигателя перед запуском при низких t_нв, контроль роста давления масла при запуске, контроль Р_м и t°_м при работе двигателя, контроль утечки масла при работе двигателя по запаху и визуально (горелое масло и шлейф белого дыма на выходе двигателя), контроль расхода масла, который должен быть не более 0,3 л/ч, состояние маслофильтра и цвет масла (потемнение).

It ensures oil scavenge from these supports during engine “run-down”. This valve is closed if TC RPM less than 15% and if oil pressure difference on the valve ΔP < 0.3±0.05kg/sm².

1. The reduction bypass valve adjusted for oil pressure difference ΔP = 1.25 kg/sm² prevents oil pressure increase in the oil scavenge pipeline.

2. In order to obtain the pre-set rarefaction in the drive box and in the first support cavity provision is made for outward venting through the breather with an adjustable jet in the accessory drive cavity.

3. Breathing of oil cavities is carried out through scavenge pumps, the oil tank and vent tank installed inside the oil tank. The end of the vent pipe opens into exhaust pipe.

8.4. PROBABLE TROUBLES

1. Oil pressure does not correspond to specifications.

Reasons:

- pressure gauge is out of order;

- oil filter is clogged;

- air lock at the inlet of the oil pump;

- reduction valve is out of order;

- insufficient oil quantity in the oil tank;

- oil overheating;

- inner damage of the oil system element.

1. Oil temperature increase.

Reasons:

- oil temperature gauge is out of order;

- insufficient oil quantity in the oil tank;

- oil cooler cells are clogged;

- insufficient cooling of the oil cooler;

- oil cooler thermoregulator failure.

1. Oil consumption is high.

Reasons:

- oil ejection from the vent pipe;

- oil leakage;

- wearing out of the oil seal;

- jet clogging;

- oil pressure difference on the oil seals is not constant;

4. Much smoke and oil leakage takes place from exhaust pipe during engine shut-down.

Reasons:

- cut-off valve is out of order;

- centrifugal fuel pump drive seal damaging;

- improper condition of the oil pump.

8.5. OIL SYSTEM OPERATION PECULIARITIES

The oil system should be checked for serviceability and proper state during technical maintenance, pre-flight inspection and with engines running on the ground and in flight.

The crew should pay special attention to the following:

- oil system filling;

- inspection of the engines for oil leak before start up;

- engines warming up before starting when ambient temperature is low;

- oil pressure during start up;

- oil temperature and pressure during engine operation;

- oil leak during engine operation by following attributes:

- smell and white smoke from the engine exhaust;

- oil consumption should not be more than 0.3liter per hour;

- oil filter condition and oil color should not become dark.

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