Ice and Rain Protection

Question 1

Would engine lip anti-ice protection be available on the aircraft after a loss of all DC power?

Answer 1

Yes. Although the engine lip anti-ice valve is DC powered, it fails in the open position.
Reference: OM Vol.2, Section 2-14

Question 2

When is the wing and horizontal stabilizer anti-ice protection inhibited?

Answer 2

On the ground with a wheel speed < 25 knots.

Reference: OM Vol.2, Section 2-14

Question 3

What differences are found in the XR anti-ice systems compared to the other EMB- 135/145 variants?

Answer 3

The 145XR upper wing surface contains DC-powered clear ice detectors that function on the ground only.
Reference: OM Vol.2, Section 2-14

Question 4

What power sources allows for electrical heating of Pitot/Satic 3?

Answer 4

An essential bus.

Reference: OM Vol.2, Section 2-14, Section 2-5

Question 5

When will the clear ice detectors on the 145XR trigger a CLR ICE EICAS message?

Answer 5

On the ground only, when clear ice is detected on the upper surface of the wing.

Question 6

What is the functionality of engine lip anti-ice protection in the essential power configuration with a loss of all generators?

Answer 6

The engine lip anti-ice system operates continuously and cannot be turned off. The engine-lip anti-ice valve is DC powered and fails open.
Reference: OM Vol.2, Section 2-14

Question 7

During essential power with a loss of all generators, is wing and stabilizer anti-ice protection available?

Answer 7

No, wing & stabilizer anti-ice is DC powered.

Reference: OM Vol.2, Section 2-14

Question 8

During ice test A, where should the override knob be positioned and how long should the test switch be held?

Answer 8

The override knob should be placed in the ALL position and the test switch must be held in each position for at least 10, no longer than 15 seconds.
Reference: OM Vol.1, Section 3, Ice Protection Test Procedure

Question 9

How are the bleeds configured for a takeoff in icing conditions?

Answer 9

The engine bleeds should be open and the APU bleed should be closed.
Reference: OM Vol.1, Section 3, Before Takeoff Checklist

Question 10

Is it possible to use the APU bleed for air conditioning while taxiing in icing conditions?

Answer 10

Yes. The APU bleed may be used to provide air conditioning. The engine lip anti-icing bleed air is tapped off prior to the engine bleed valve. For this reason, the engine bleed may be closed during a taxi in icing conditions.
Reference: OM Vol.2, Section 2-14

Question 11

When is engine lip anti-ice required?

Answer 11

Whenever the temperature is less than or equal to 10° C and at least one form of visible moisture is present.
Reference: OM Vol.1, Section 3, Flight Operations in Icing Conditions

Question 12

When is an ice protection penalty required when evaluating the runway analysis charts?

Answer 12

Whenever Ref A/ICE ON is selected in the takeoff data during a takeoff in icing conditions.
Reference: OM Vol.1, Section 5, Performance Weights

Question 13

What ice protection is available for the static ports, pitot tubes, and TAT probes?

Answer 13

They are heated electrically

Reference: OM Vol.2, Section 2-14

Question 14

When will the ice protection system be automatically activated?

Answer 14

Anytime one or both ice detectors detect ice.

Reference: OM Vol.2, Section 2-14

Question 15

What should be checked when conducting Ice Test A?

Answer 15

For each side, separately, check that the OPEN inscriptions in the deice valve buttons are illuminated and that ICE DET 1 (2) FAIL and BLD 1 (2) LOW TEMP caution messages and the ICE CONDITION advisory message are displayed on the EICAS.
Reference: OM Vol.1, Section 3, Ice Protection Test Procedure

Question 16

What should be checked when conducting the on ground portion of Ice Test B (non-XR)?

Answer 16

For each side, separately, check that the ICE DET 1 (2) FAIL and BLD 1 (2) LOW TEMP caution messages and the ICE CONDITION advisory message are displayed on the EICAS.
Reference: OM Vol.1, Section 3, Ice Protection Test Procedure

Question 17

What should be checked when conducting the in fight portion of Ice Test B?

Answer 17

Select the Override knob to ALL for 20 seconds and check that the OPEN inscriptions in the buttons are illuminated and the NO ICE-A/ICE ON caution message is displayed on the EICAS. The CROSS BLD OPEN advisory message may also be displayed.
Reference: OM Vol.1, Section 3, Ice Protection Test Procedure

Question 18

At what altitude and temperature range should the in fight portion of Ice Test B be accomplished?

Answer 18

From 2,000’ AGL to 23,000’ MSL and a SAT less than 10°C Reference: OM Vol.1, Section 3, Ice Protection Test Procedure