AD/AMD 10/25 Amdt 1 Wing Anti-Ice Hoses (Cth)

AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AMD 10/25 and issues the following 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.

AMD Falcon 10 Series Aeroplanes

AD/AMD 10/25 Amdt 1 Wing Anti-Ice Hoses 9/2005 TX

Applicability:

Dassault Aviation Falcon 10 Aircraft.

Requirement:

1.    Aircraft Flight Manual (AFM) Limitations and Placard:

Revise the Limitations section of the Aircraft Flight Manual (AFM); and install a placard in the flight deck, to include the following information.

“Flights into known or forecast icing conditions are prohibited.”

The AFM revision may be done by inserting a copy of this Airworthiness Directive (AD) into the AFM. Install the placard in clear view of the pilot.

OR

2.    Inspection:

(a)     Perform a detailed inspection of the internal walls of the hoses for delamination, and perform any applicable corrective action as per provisions of Dassault Alert Service Bulletin (SB) F10-A312 Revision 1 dated 27 June 2005 or later EASA approved revisions. If any blister is found in the hose, replace that hose with a hose part numbered (P/N) FAL1005D.

          Submit the inspection findings to the manufacturer. The report must include the aircraft serial number, the location of the hose (inboard / outboard), the number of flight hours since hose installation, the number of cycles in icing conditions, and the manufacturing date and batch number of the hose.

(b)     Insert the following instruction in the Airworthiness Limitations section of the Aircraft Maintenance Manual (AMM). This can be achieved by inserting a copy of this AD in Chapter 5-40 of the AMM:

Operation	Reference	Threshold	Interval
30 - Anti-icing Boroscopic inspection of the wing slats anti-ice flexible hoses.	(SB) F10-A312 R1	10 flights with anti ice system activated. Life limit: 3000 hours.

Note 1:   EASA Airworthiness Directive EASA.A.AD.01001 dated 29 June 2005 refers.

Compliance:

1.       Within the next 10 flights with Anti-Ice system in use, after the effective date of this Directive.

2.       (a)     Within the next 10 flights with Anti-Ice system in use, after the effective date of this Directive; and then repetitively every 10 flight cycles with anti ice system activated. 

Note 2:  With this end in view, the flight crew should record on the flight log, any time the Anti-Ice system switch is ON, in flight, (i.e. to the exclusion of the pre-flight check) to be able to determine the first time- limited inspection & the recurring ones.

2.       (b)     Within five days, after the effective date of this Directive.

This Amendment becomes effective on 5 July 2005.

Background:

There has been a reported incident of a wing anti-ice flexible hose collapse on a Falcon 10 aircraft.  The hose collapsed because of the internal ply separation of the flexible hose.  Due to the resulting insufficient anti-icing, ice accretion on the wing can occur, jeopardizing the aircraft flight performance and safety.

The original issue of this Airworthiness Directive required repetitive inspections at an interval of 60 flight cycles.  This amendment introduces repetitive boroscope inspection with reduced periodicity of 10 flight cycles.

The original issue of this Airworthiness Directive became effective on 8 March 2005.

James Coyne
Delegate of the Civil Aviation Safety Authority

4 July 2005