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requirements of that Airworthiness Directive unless otherwise agreed with the Authority of the State of Registry.
Type Approval Holder’s Name :
AIRBUS
Type/Model designations:
A318, A319, A320 and A321 aircraft
TCDS Number : EASA.A.064
Foreign AD : None
Supersedure: DGAC AD F-2005-191, EASA approval No. 2005-6411
ATA 32 Landing Gear - Nose landing gear – Wheels at 90 degrees
Manufacturers: AIRBUS (formerly AIRBUS INDUSTRIE)
Applicability: AIRBUS A318, A319, A320 and A321 aircraft, all certified models and all
serial numbers that are equipped with or have ever been equipped with a
EMM Breaking/Steering Control Unit (BSCU) part number (PN):
- PN E21327001 (standard L4.1) installed by AIRBUS Modification
26965 or by AIRBUS Service Bulletin (SB) A320-32-1912
Or
- PN E21327003 (standard L4.5) installed by AIRBUS Modification
33376 or SB A320-32-1261.
Aircraft on which the BSCU has always been standard L4.8 ( modification
35216 : installation of EMM BSCU PN E21327004) or non EMM BSCU are
not affected by the requirements of this Airworthiness Directive (AD).
Reason: 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 loose their centred position reference normally ensured by the
shock-absorber cams. The Braking and Steering Control Unit (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
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proceed with the re-centring of the wheels.
To prevent reoccurrence of landings with NLG turned 90 degrees, AD F-
2005-191 that dealt with the same subject, rendered mandatory an
operational procedure and maintenance actions.
This AD supersedes AD F-2005-191 and is issued to extend the
applicability and to introduce a repetitive boroscopic inspection of the NLG
upper support lugs and cylinder lugs.
Effective Date: 05 July 2006
Compliance: 1. Operational procedure only applicable to aircraft listed in the
applicability paragraph that have not received AIRBUS modification
31152 in production (i.e. applicable only to aircraft with the steering
powered by the green hydraulic system).
From the effective date of this AD , the following operational procedure is
mandatory for all flights:
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 ECAM WHEEL
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-centring and steering
recovery.
- Rearm the AUTO BRAKE, if necessary.
􀁹 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 centred.
- During landing, delay nose wheel touchdown for as long as
possible.
- Refer to the ECAM STATUS
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􀂾 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/W STRG FAULT
ECAM caution procedure.
- Refer to the ECAM STATUS
Incorporation of this AD 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 or subsequent standard in the Aircraft Operations
Manual as well as in the Aircraft Flight Manual and strict adherence by the
crew allows complying with paragraph compliance 1 of this AD.
2. For all aircraft listed in the applicability paragraph:
Within 100 flight cycles following an ECAM caution 'L/G SHOCK
ABSORBER FAULT' associated with at least one of the below 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'.
2.1. Check the NLG strut inflation pressure, weight off and weight on
wheels, in accordance with AIRBUS Aircraft Maintenance Manual
　
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