NATOPS Chapter 2 Engine Oil, Start, Parameter sensing HSM-50

Question 1

The engine oil system is

Answer 1

Self-contained, pressurized, recirculating dry sump system

Question 2

A malfunctioning starter may be overridden by _____________

Answer 2

Manually holding in the starter until NG reaches 52 to 65% NG

Question 3

Two ways to get pneumatic power for engine starts

Answer 3

APU

Engine crossbleed

Question 4

What are the 3 ways to anti-ice the engine?

Answer 4

1) vent bleed air into the engine swirl vanes and inlet guide vanes by the ENG ANTI-ICE/START BLEED VALVE.
2) vent bleed air into the airframe engine inlet by the ENGINE INLET ANTI - ICE VALVE
3) Continuously pump engine oil through the SCROLL VANES

Question 5

ENGINE ANTI-ICE/START BLEED VALVE uses what type of air?

Answer 5

5th stage bleed air

Question 6

ENGINE ANTI ICE START BLEED VALVE malfunction is indicated by:

Answer 6

• Appearance or disappearance of ENG ANTI ICE ON advisory outside of specified range (somewhere between 80.5 and 96.5 deg is the transition range. Off above this range, on below this range) (at OAT of 20C, transition range is 85.5 to 90.5)
• NO illumination when the switch is ON.
• NO rise in TGT when switch is on.

Question 7

With Eng anti ice on max TQ is reduced by

Answer 7

18%

Question 8

INLET ANTI-ICE operates as follows:

Answer 8

Less than 4 OAT, the valve is open and the advisory comes on when inlet temp hits 93 C.

Between 4 and 13 OAT, The valve is controlled buy by a Freon Bellows begins closing at 4° and is completely closed at 13.

Above 13 OAT the valve is closed.

Question 9

The two NP sensors send information to?

Answer 9

• The left sensor provides an Np signal to the DECU and the VIDS
• The right sensor feeds the torque computation circuit and the Np overspeed protection system

Question 10

NG is sensed by?

Answer 10

The alternator sending a signal to the vertical instruments

Question 11

TGT sensing

Answer 11

Thermocouple harness of 7 thermo couples that are averaged together and sent to the vertical instruments.

Question 12

If DECU is not powered by either the ALTERNATOR or the backup 400 hz through ENG OVSP circuit the DECU will_______.

Answer 12

Indicate 71° higher than expected

Question 13

How many main sump bearings are there in the Oil system?

Answer 13

6

Question 14

How does the engine provide redundancy if a malfunction or damage totally interrupts the normal supply of oil?

Answer 14

The engine has 2 sets of oil jets to provide each main bearing with oil

Question 15

What causes the #1/#2 OIL FLTR BYPASS caution to illuminate?

Answer 15

The oil filter bypass sensor switch

Question 16

When does the thermal lockout for the oil PDI work?

What is it for?

Answer 16

below 38 C

to prevent the pdi from popping during cold-weather starts

Question 17

How is oil cooled?

Answer 17

The fuel/oil cooler and the air/oil cooler (Scroll vanes)

Question 18

Does the Engine Chip Detector have a burnoff feature?

Answer 18

no

Question 19

What does the APU provide during engine start?

Answer 19

bleed air and electrical power

Question 20

What position does the AIR SOURCE ECS/START switch need to be in for the APU to provide pneumatic power?

Answer 20

Doesn’t matter, APU will provide pneumatic power regardless of the switch position

Question 21

For a crossbleed start, what must Ng be for the receiving engine?

What does this require the donor engine Ng to be?

Answer 21

Shall be a minimum of 24%

90-94%

Question 22

With a faulty engine inlet anti-ice modulating valve, you could lose ___ power.

Answer 22

49%

Question 23

When DE-ICE MASTER switch is on, and Ice is detected, what turns on?

Answer 23

• ENG ANTI-ICE
• WINDSHIELD ANTI-ICE
• BLADE DEICE POWER

Question 24

How is Np sensed?

Answer 24

The power turbine has 2 sets of teeth that induce electrical pulses in the Np sensors. These teeth permit measurement of the torsion or twist of the shaft which is proportional to torque output