AD/BEECH 400/22 - Loss of Airspeed Indication

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AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

 

Beechcraft 400 Series Aeroplanes

 

AD/BEECH 400/22 Loss of Airspeed Indication 2/2002

TX

 

Applicability: All Model Beech 400, 400A and 400T series aeroplanes.

 

Requirement: Revise the Emergency Procedures Section of the Aircraft Flight Manual (AFM) by inserting a copy of the relevant AFM Temporary Change from the following list:

 

 

 

 

 

 

 

 

 

 

 

 

 

or,


Aircraft Model

 

Beechjet 400T Beechjet 400T Beechjet 400A Beechjet 400A Beechjet 400A Beechjet 400A Beechjet 400A Beechjet 400A Beechjet 400

Beechjet 400


Temporary Change Part Number

 

132-590002-5TC3, dated 12 November 2001

134-590002-1TC3, dated 12 November 2001

128-590001-91TC5, dated 12 November 2001

128-590001-95TC5, dated 12 November 2001

128-590001-107TC5, dated 12 November 2001

128-590001-109TC5, dated 12 November 2001

128-590001-167TC7, dated 12 November 2001

128-590001-169TC3, dated 12 November 2001

128-590001-13BTC1, dated 12 November 2001

128-590001-13BTC2, dated 12 November 2001

 

by inserting a copy of this Directive into the AFM including the following procedures:

 

``Emergency Procedures (400) Loss of Airspeed

Note: If the pilot's and/or copilot's airspeed(s) are noted to be decreasing toward zero, refer to the AOA indicator for airspeed control and land at the nearest suitable airport.

  1. Autopilot - Disconnect
  2. Airspeed - Slow to and Maintain 0.2 AOA
  3. Thrust - As Required
  4.               Speed Brakes - As Required (Slow to 0.25 AOA with speed brakes extended)

 

Note: An AOA of 0.2 (0.25 with speed brakes extended) will yield an airspeed of about 210 knots. Use pitch attitude as the primary reference. Make small changes in pitch and wait for the AOA to stabilize.

 

When Ready for Descent

5.         Seat Belts/Shoulder Harnesses - Fastened

6.         Cabin Sign - As Required

7.         Recognition Light - As Required

8.         Anti/De-Ice Systems - As Required

Caution

 

If icing conditions are anticipated during the descent and approach, turn ice protection systems ON as early as possible prior to penetrating clouds.

Maintain wing anti/deice operation light ON (approximately 70% N2) during descent to assure proper wing anti-ice operation.

9.         Cabin Pressure Control - Set Field Elevation + 500 Feet

10.     Windshield Defog - As Required

11.     Altimeters - Set

When Ready for Approach

 

12.     Airspeed - Slow to and Maintain 0.3 AOA

 

Note: Maintain 0.3 AOA throughout the configuration change to Flaps 10 deg. Gear Down. This will yield an airspeed of about 180 knots.

13.     Fuel Management - Check

14.     N1, Landing Distance - Confirm

15.     Cabin Sign - Safety

16.     Windshield Anti-Ice - Low

17.     Hydraulic/Nitrogen Pressure - Check

18.     Engine Sync - Off

19.              Flaps 10 deg.

 

Before Landing

20.          AOA Index - Preset 1.3 V/Vs

21.          Landing Gear - Down

22.          Airspeed - Slow to 0.4 AOA

23.          Recognition Light - Off

24.          Landing Lights - As Required

25.          Ignitions - On

26.          Flaps - 30 deg.

27.          Approach Airspeed (VREF) - Slow to and Maintain 0.57 AOA

Note: This will yield a normal approach speed of VREF (0.57 AOA) and normal landing distances.

 

Balked Landing

28 Thrust - Takeoff N1

29.     Pitch Attitude - 10 deg.

When Positive Climb Has Been Established

30.     Flaps - 10 deg.

31.     Landing Gear - Up

32.     Airspeed - Accelerate to 0.3 AOA

33.     Flaps - Up

34.     Airspeed - Accelerate and Maintain 0.2 AOA

35.     Landing Lights - Ret/off

Emergency Procedures (400A & RJ-61) Loss of Airspeed

Note: If the pilot's, or copilot's and standby, or all three airspeed(s) are noted to be decreasing toward zero, refer to the standby attitude indicator, standby altimeter, standby heading and the AOA indicator for aircraft control and land at the nearest suitable airport. On PFD equipped airplanes, the pilot's and copilots altimeters, attitude displays and heading displays may be unreliable and the autopilot may disconnect. This may be accompanied by amber boxed A/S, ALT, ATT and/or HDG comparator flags. The comparator flags may be followed by red FAIL flags and removal of airspeed and altitude tapes and attitude/heading displays.

  1. Autopilot - Disconnect
  2. Airspeed - Slow to and Maintain 0.2 AOA
  3. Thrust - As Required
  4. Speed Brakes - As Required (Slow to 0.25 AOA with speed brakes extended)

Note: An AOA of 0.2 (0.25 speed brakes extended) will yield an airspeed of about 210 knots. Use pitch attitude as primary reference. Make small changes in pitch attitude and wait for AOA to stabilize.

 

When Ready for Descent

5.         Seat Belts/Shoulder Harnesses - Fastened

6.         Cabin Sign - As Required

7.         Recognition Light - As Required

8.         Anti/De-Ice Systems - As Required

Caution

 

If icing conditions are anticipated during the descent and approach, turn ice protection systems ON as early as possible prior to penetrating clouds.

Maintain wing anti/deice operation light ON (approximately 70% N2) during descent to assure proper wing anti-ice operation.

9.         Cabin Pressure Control - Set Field Elevation + 500 Feet

10.     Windshield Defog - As Required

11.     Altimeters - Set

When Ready for Approach

 

12.     Airspeed - Slow to and Maintain 0.3 AOA

 

Note: Maintain 0.3 AOA throughout the configuration change to Flaps 10 deg., Gear Down. This will yield an airspeed of about 180 knots.

13.     Fuel Management - Check

14.     N1, Landing Distance - Confirm

15.     Cabin Sign - Safety

16.     Windshield Anti-Ice - Low

17.     Hydraulic/Nitrogen Pressure - Check

18.     Engine Sync - Off

19.              Flaps - 10 deg.

 

Before Landing

20.     AOA Index - Preset 1.3 V/Vs

21.     Landing Gear - Down

22.     Airspeed - Slow to 0.4 AOA

23.     Recognition Light - Off

24.     Landing Lights - As Required

25.     Ignitions - On

26.     Flaps - 30 deg.

27.     Approach Airspeed (VREF) Slow to and Maintain 0.57 AOA

Note: This will yield a normal approach speed of VREF (0.57 AOA) and normal landing distances.

 

28.     Yaw Damp - Off

 

Balked Landing

29.     Thrust - Takeoff N1

30.     Pitch Attitude 10 deg.

When Positive Climb Has Been Established

31.     Flaps - 10 deg.

32.     Landing Gear - Up

33.     Yaw Damp - On

34.     Airspeed - Accelerate to 0.3 AOA

35.     Flaps - Up

36.     Airspeed - Accelerate and Maintain 0.2 AOA

37.     Landing Lights - Ret/off

Emergency Procedures 400T(T-1A) Loss of Airspeed

Note: If the pilot's, or copilot's and standby, or all three airspeed(s) are noted to be decreasing toward zero, refer to the standby attitude indicator, standby altimeter, standby heading and the AOA indicator for aircraft control and land at the nearest suitable airport. The pilot's and copilots altimeter's, attitude displays and heading displays may be unreliable and the autopilot may disconnect. This may be accompanied by amber boxed A/S, ALT, ATT and/or HDG comparator flags. The comparator flags may be followed by red FAIL flags on the airspeed, altitude, attitude and heading displays.

  1. Autopilot - Disconnect
  2. Airspeed - Slow to and Maintain 0.2 AOA
  3. Thrust - As Required
  4. Speed Brakes - As Required (Slow to 0.25 AOA with speed brakes extended)

Note: An AOA of 0.2 (0.25 speed brakes extended) will yield an airspeed of about 210 knots. Use pitch attitude as primary reference. Make small changes in pitch attitude and wait for AOA to stabilize.

 

When Ready for Descent

5.         Seat Belts/Shoulder Harnesses - Fastened

6.         Cabin Sign - AS Required

7.         Anti/De-Ice Systems - As Required

Caution

 

If icing conditions are anticipated during the descent and approach, turn ice protection systems ON as early as possible prior to penetrating clouds.

Maintain wing anti/deice operation light ON (approximately 70% N2) during descent to assure proper wing anti-ice operation.

8.         Cabin Pressure Control - Set Field Elevation + 500 Feet

9.         Windshield Defog - As Required

10.     Altimeters - Set

When Ready for Approach

 

11.     Airspeed - Slow to and Maintain 0.3 AOA

 

Note: Maintain 0.3 AOA throughout the configuration change to Flaps 10 deg., Gear Down. This will yield an airspeed of about 180 knots.

12.     Fuel Management - Check

13.     N1, Landing Distance - Confirm

14.     Cabin Sign - Safety

15.     Windshield Anti-Ice - Low

16.     Hydraulic/Nitrogen Pressure - Check

17.     Engine Sync - Off

18.     Flaps - 10 deg.

19.              GPWS TAC and FLP ORIDE - Off

 

Before Landing

20.     AOA Index - Preset 1.3 V/Vs

21.     Landing Gear - Down

22.     Airspeed - Slow to 0.4 AOA

23.     Landing Lights - As Required

24.     Ignitions - On

25.     Flaps - Set for Landing

26.     Approach Airspeed (VREF) - Slow to and Maintain 0.57 AOA

Note: This will yield an approach speed of VREF (0.57 AOA) and normal landing distances.

 

27.     Yaw Damp - Off

 

Caution

 

If icing conditions are encountered during flight, the maximum landing flap is 10 deg. unless one of the following are met.

 

The icing conditions are encountered for less than 10 minutes, and the RAM Air Temperature (RAT) during the encounter was warmer than -8 deg.C.

 

A RAT of +10 deg.C, or warmer, is observed during the descent, approach or landing.

 

If either of the above two conditions are met, Flaps 30 deg. may be used for landing.

 

Balked Landing

28.     Thrust - Takeoff N1

29.     Pitch Attitude - 10 deg.

When Positive Climb Has Been Established

30.     Flaps - 10 deg.

31.     Landing Gear - Up

32.     Yaw Damp - On

33.     Airspeed - Accelerate to 0.3 AOA

34.     Flaps - Up

35.     Airspeed - Accelerate and Maintain 0.2 AOA

36.              Landing Lights - Ret/off

 

Emergency Procedures 400T(TX) Loss of Airspeed

Note: If the pilot's, or copilot's and standby, or all three airspeed(s) are noted to be decreasing toward zero, refer to the standby attitude indicator, standby altimeter, standby heading and the AOA indicator for aircraft control and land at the nearest suitable airport. The pilot's and copilots altimeter's, attitude displays and heading displays may be unreliable and the autopilot may disconnect. This may be accompanied by amber boxed A/S, ALT, ATT and/or HDG comparator flags. The comparator flags may be followed by red FAIL flags on the airspeed, altitude, attitude and heading displays.

  1. Autopilot - Disconnect
  2. Airspeed - Slow to and Maintain 0.2 AOA
  3. Thrust - As Required
  4. Speed Brakes - As Required (Slow to 0.25 AOA with speed brakes extended)

Note: An AOA of 0.2 (0.25 speed brakes extended) will yield an airspeed of about 210 knots. Use pitch attitude as primary reference. Make small changes in pitch attitude and wait for AOA to stabilize.

 

When Ready for Descent

5.         Seat Belts/Shoulder Harnesses - Fastened

6.         Cabin Sign - As Required

7.         Anti/DeIce Systems - As Required

Caution

 

If icing conditions are anticipated during the descent and approach, turn ice protection systems ON as early as possible prior to penetrating clouds.

Maintain wing anti/deice operation light ON (approximately 70% N2) during descent to assure proper wing anti-ice operation.

8.         Cabin Pressure Control - Set Field Elevation + 500 Feet

9.         Windshield Defog - As Required

10.     Altimeters - Set

When Ready for Approach

 

11.     Airspeed - Slow to and Maintain 0.3 AOA

 

Note: Maintain 0.3 AOA throughout the configuration change to Flaps - 10 deg., Gear Down. This will yield an airspeed of about 180 knots.

12.     Fuel Management - Check

13.     N1, Landing Distance - Confirm

14.     Cabin Sign - Safety

15.     Windshield Anti-Ice - Low

16.     Hydraulic/Nitrogen Pressure - Check

17.     Engine Sync - Off

18.     Flaps - 10 deg.

Before Landing

19.     AOA Index - Preset 1.3 V/Vs

20.     Landing Gear - Down

21.     Airspeed - Slow to 0.4 AOA

22.     Landing Lights - As Required

23.     Ignitions - On

24.     Flaps - 30 deg.

25.     Approach Airspeed (VREF) - Slow to and Maintain 0.57 AOA

Note: This will yield a normal approach speed of VREF (0.57 AOA) and normal landing distances.

 

26.     Yaw Damp - Off

 

Balked Landing

26.     Thrust - Takeoff N1

27.     Pitch Attitude 10 deg.

When Positive Climb Has Been Established

29.     Flaps 10 deg.

30.     Landing Gear - Up

31.     Yaw Damp - On

32.     Airspeed - Accelerate to 0.3 AOA

33.     Flaps - 0 deg.

34.     Airspeed - Accelerate and Maintain 0.2 AOA

35.     Landing Lights - Ret/off''

 

 

Note 1: When a previously specified Temporary AFM revision has been incorporated into the general revisions of the AFM, the general revision may be inserted in the AFM, provided the information contained in the general revision is identical to that specified in the specified Temporary AFM revision.

 

Note 2: FAA AD 2001-24-11 Amdt 39-12528

 

Compliance: Within five days after the effective date of this Directive.

 

This Airworthiness Directive becomes effective on 11 December 2001.

 

Background:  The United States Federal Aviation Administration has received several reports of loss of the pilot's and/or the co-pilot's Indicated Airspeed (IAS) display on certain Raytheon Model Beech 400A series aeroplanes. Such loss of IAS display may lead to loss of the altitude displays and up to 10 degrees of pitch error in the pilot's and/or co- pilot's attitude display. Loss of the IAS display can also adversely affect the display for altitude and attitude (Attitude/Heading/Reference System) and can result in uncommanded autopilot or yaw damper disengagement. The reported incidents occurred between 38,000 and 41,000 feet of altitude while the airplanes were in cruise or during initial descent. In the reported incidents, the altitude indication returned to normal at an undetermined point in the descent, and the airplanes landed without further incident. Investigation of those reports indicates that the cause of the loss of airspeed indication display may be due to water freezing in the pitot systems.

This Directive requires revision of the AFM Emergency Procedures Section to ensure the flightcrew is advised of in-flight procedures in the event of loss of airspeed indication.


 

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 7 December 2001

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


The above AD is notified in the Commonwealth of Australia Gazette on 11 December 2001.

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