AD/Premier/6 Hydraulic Pump Pressure Output Hose (Cth)

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.

Hawker Beechcraft (Raytheon) 390 Series Aeroplanes

AD/PREMIER/6 Hydraulic Pump Pressure Output Hose 13/2008 DM

Applicability:

Hawker Beechcraft Corporation Model 390 aeroplanes:

1.    Serial numbers (S/N) RB-1 and RB-4 through RB-209 equipped with hose kit 390-5805-0001 installed during compliance with Hawker Beechcraft Mandatory Service Bulletin 29-3800, dated May 2007; and

2.    S/N RB-210 though RB-239.

Requirement:

1.    Initially inspect for suspect engine hydraulic pump pressure output hose assemblies, left part number (P/N) 170H143-6CR-0174 and right P/N 170H192D0394C275, by looking at the identification tags for work order numbers and manufacturing dates listed in Table 1 of Hawker Beechcraft Mandatory Service Bulletin (SB) 29-3897, dated August 2008.

If, as a result of this inspection, you find these affected hose assemblies are not installed, no further action is required by this AD.

2.    If as a result of the inspection required in Requirement 1 of this AD, it is found that one of the hose assemblies is installed, inspect for evidence of hydraulic fluid leakage in accordance with Hawker Beechcraft Mandatory SB 29-3897.

3.    Replace the hose assembly.

Note:  FAA AD 2008-22-11 Amdt 39-15707 dated 17 October 2008 refers.

Compliance:

For Requirement 1 - Within 10 hours time-in-service (TIS) after the effective date of this AD.

For Requirement 2 - Initially within 10 hours TIS after the effective date of this AD and repetitively thereafter at intervals not to exceed 10 hours TIS until whichever of the following occurs first:

(a)   When 40 hours total TIS is accumulated on the installed hose assembly; or

(b)   When the hose assembly is replaced following the procedures in the service information.

For Requirement 3 - Whichever applies and occurs first:

(a)   Before further flight after any inspection where hydraulic fluid leakage was found; or

(b)   Within the next 200 hours TIS after the effective date of this AD) or within the next 6 months after the effective date of this AD whichever occurs first.

This Airworthiness Directive becomes effective on 3 November 2008.

Background:

This AD is the result of reports of hydraulic leaks from the hydraulic pump pressure output hose assemblies.  The issuing of this AD is intended to prevent leakage of hydraulic fluid from the pump output hose within the engine compartment, which could cause an in-flight fire.

This AD requires you to inspect hydraulic pump pressure output hose assemblies to determine if they are from the affected lots, inspect for hydraulic fluid leaks if the hose assemblies are from the affected lots, and replace all affected hose assemblies.

James Coyne
Delegate of the Civil Aviation Safety Authority

28 October 2008