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Military Aircraft

Volume 501: debated on Wednesday 18 November 2009

To ask the Secretary of State for Defence what the (a) required and (b) actual level of spare part availability is for each aircraft type in the Royal Air Force.

[Official Report, 27 January 2009, Vol. 487, c. 310-12W.]

Letter of correction from Mr. Quentin Davies:

An error has been identified in the written answer given to the hon. Member for Woodspring (Dr. Fox) on 27 January 2009. The entry in the table for the Sentry aircraft was incorrect.

The correct answer should have been: (249704)

The required level of spares for RAF aircraft is included in contractual agreements with industry, or is set by the Front Line Command. The achieved level of available spares is measured as part of these agreements.

The following information for the required and achieved level of spares is provided as at 30 November 2008 unless otherwise stated. Although not used as a performance indicator as part of a contract with industry, the off the shelf satisfaction rate (OTSSR) is also measured for some aircraft types, and is therefore included in the table. The OTSSR is defined as the percentage of demands for spares satisfied direct from MOD stock.

Percentage

Aircraft

Requirement

Achieved

OTSSR

Typhoon

80

76

76

Tornado GR4

Provided under an aircraft availability contract with industry; spares availability is not measured.

95

Tornado F3

As above

98

Harrier GR7/GR9/T10/T12

85% of spares to be delivered within the required delivery date

86

96

Nimrod MR2/R1

Provided under an aircraft availability contract with industry; spares availability is not measured

Tristar

85

83

74

VC10

80

87

Sentry

Provided under an aircraft availability contract with industry; spares availability is not measured

Sentinel

75, 95 and 95% of 1spares to be delivered within the required delivery date

281, 73 and 71

Hercules C-130J/K

Provided under an aircraft availability contract with industry; spares availability is not measured.

C-17

As above

BAE 146

Spares availability is not measured3

BAE 125

As above

Sea King 3/3a airframe4

Less than 5% operational days lost due to lack of spares

0.1% operational days lost in Oct-Dec 2008

965

Sea King engines6

95

95

595

Dominie

Spares availability is not measured.

85

HawkTl/T2

Provided under an aircraft availability contract with industry; spares availability is not measured.

86

Tucano

As above

95

Vigilant Glider

Spares availability is not measured.

95

Viking Glider

As above

95

1 75% figure is for mission non-critical spares, 95% is for mission critical spares and 95% is for consumables.

2 This was for the period October-December 2008.

3 These aircraft are military derivatives of civil aircraft. Spare parts are procured on a “just-in-time” basis from the civil market to supplement minimum stock holdings held at the main and forward operating bases.

4 The Sea King Mk 3/3a is used by the RAF in the Search and Rescue role.

5 As at 31 October 2008.

6 These figures include the Sea King Mk4, Mk5 and Mk7 operated by the Royal Navy.