适航指令AIRWORTHINESS DIRECTIVE Nose Landing Gear Steering

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105
CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Page 1 of 3
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 39.001(1) of CASR 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.
Airbus Industrie A319, A320 and A321 Series Aeroplanes
AD/A320/187 Nose Landing Gear Steering 1/2006
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Applicability: AIRBUS A318, A319, A320 and A321 aircraft that are equipped with a Braking and
Steering Control Unit (BSCU) part number (PN) E21327001 (Standard L4.1,
AIRBUS Modification 26965 - Service Bulletin A320-32-1912) or PN E21327003
(Standard L4.5, AIRBUS Modification 33376 - Service Bulletin A320-32-1261).
This Airworthiness Directive (AD) is not applicable to aircraft that have been
delivered and equipped with BSCU standard L4.8 from production incorporating
modification 35216.
Requirement: 1. The following operational procedure is only for those aircraft that have not
incorporated AIRBUS modification 31152 in production (i.e. applicable only to
aircraft with the steering powered by the green hydraulic system).
Incorporate the following into in the Aircraft Operations Manual, or AFM TR
4.02.00/33 for aircraft without FWC H2E3P or H1E3P or subsequent standard, or
TR 4.02.00/34 for aircraft with FWC H2E3P or H1E3P.
The ECAM message, in case of a nose wheel steering failure, will be worded as
follows:
- “WHEEL N/W STRG FAULT” for aircraft with FWC software post E3P
- “WHEEL N.W STEER FAULT” for aircraft with FWC software pre E3P
􀂾 If the L/G SHOCK ABSORBER FAULT ECAM caution is triggered at
any time in flight, and the WHEEL N/W STRG FAULT ECAM caution
is triggered after the landing gear extension:
• When all landing gear doors are indicated closed on ECAMWHEEL
page, reset the BSCU:
- A/SKID&N/W STRG---------------------------OFF THEN ON
• If the WHEEL N/W STRG FAULT ECAM caution is no longer
displayed, this indicates a successful nose wheel re-centering and
steering recovery.
- Rearm the AUTO BRAKE, if necessary.
Federal Register of Legislative Instruments F2005L03704
COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105
CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Airbus Industrie A319, A320 and A321 Series Aeroplanes
AD/A320/187 (continued)
Page 2 of 3
• If the WHEEL N/W STRG FAULT ECAM caution remains
displayed, this indicates that the nose wheel steering remains lost,
and that the nose wheels are not centered.
- During landing, delay nose wheel touchdown for as long as
possible.
- Refer to the ECAM STATUS
􀂾 If the WHEEL N/W STRG FAULT ECAM caution appears, without the
L/G SHOCK ABSORBER FAULT ECAM caution:
- No specific crew action is requested by the WHEEL N/M STRG
FAULT ECAM caution procedure.
- Refer to the ECAM STATUS
2. Check the NLG strut inflation pressure, weight off and weight on wheels, in
accordance with AIRBUS Aircraft Maintenance Manual (AMM) 12-14-32 and
its associated TR issued on 13 November 2005; and
Perform a one time boroscopic inspection of the NLG upper support (backplate)
to detect anti-rotation lugs ruptured (completely broken), in accordance with
AIRBUS Technical Note 957.1901/05, dated 18 October 2005; and
Report the results of all inspections to AIRBUS.
3. If any upper support anti-rotation lugs are found ruptured (completely broken),
carry out all necessary actions to get a serviceable NLG (contact AIRBUS Fax:
33 5 61 93 32 73).
Note: DGAC AD F-2005-191 EASA reference No 2005-6411 dated 15 November
2005 refers.
Compliance: 1. From the effective date of this AD.
2. Within 100 flight cycles following an ECAM caution ‘L/G SHOCK ABSORBER
FAULT’ associated with at least one of the following Centralised Fault Display
System (CFDS) messages:
‘N L/G EXT PROX SNSR 24GA TGT POS’,
‘N L/G EXT PROX SNSR 25GA TGT POS’,
‘N L/G SHOCK ABSORBER FAULT 2526GM’.
3. Before further flight
Federal Register of Legislative Instruments F2005L03704
COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105
CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Airbus Industrie A319, A320 and A321 Series Aeroplanes
AD/A320/187 (continued)
Page 3 of 3
This Airworthiness Directive becomes effective on 5 December 2005.
Background: An event where an A320 landed with the Nose Landing Gear (NLG) wheels rotated at
90 degrees to the aircraft centreline was recently reported.
Investigation showed that the upper support of the NLG shock absorber was damaged
and the anti- rotation lugs were ruptured. This led the nose wheels to lose their
centered position reference normally ensured by the shock-absorber cams. The
BSCU had logged a steering system fault, because hydraulic power was not available
at the time of steering system checks, therefore the BSCU was not able to proceed
with the re-centering of the wheels.
To prevent reoccurrence of landings with the NLG turned 90 degrees, this AD
introduces operational procedures and maintenance actions.
James Coyne
Delegate of the Civil Aviation Safety Authority
23 November 2005
Federal Register of Legislative Instruments F2005L03704