Cessna 560 N49NS

Summary

On 18 December 2006 at about 00:07 local time, a Cessna 560 registered N49NS was involved in an accident near North Canton, Ohio, United States. 4 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

18 December 2006 at 00:07

Classification

Accident

Location

North Canton, Ohio, United States

Nearest airport

Akron-Canton Regional (CAK)

Coordinates

40.9167, -81.4500

Aircraft

Cessna 560

Registration

N49NS

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 135: Air Taxi & Commuter

Phase of flight

Not recorded

Route

Teterboro → North Canton

Aircraft damage

Substantial

Weather

VMC

Light

Night

NTSB number

CHI07LA043

Nobody was injured.

The rupture of the hydraulic pressure hose assembly, which was caused by internal wear between the hose's fire sleeve and stainless steel braid, and the failure of the emergency landing gear assembly to deploy the right main landing gear during approach. Contributing to the accident were inadequate hydraulic hose assembly maintenance inspection procedures, the lack of a hydraulic hose life limit by the airplane manufacturer, and the inadequate landing gear rigging procedures.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The airplane was on approach to the destination airport when the low hydraulic level and flow cockpit warnings annunciated in the cockpit. The flight crew was unable to extend the right main landing gear after conducting the normal and emergency landing gear extension procedures and by performing g-loading maneuvers. The airplane landed with the right wing main landing gear retracted causing substantial damage to the right wing and fuselage structures. The total loss of hydraulic power to the airplane flaps, spoilers, thrust reversers, and landing gear was caused by a ruptured hydraulic pressure hose assembly. The examinations of the accident and exemplar hoses revealed internal wear between the fiberglass within the hose's fire sleeve and the stainless steel braid. The accident hose and two of the three exemplar hoses did not show any markings or damage to the exterior of the sleeve to indicate the existence of the internal wear abrading the stainless steel braiding. Functional testing of the landing gear system revealed that the extension sequence varied during eight actuations, and, in one actuation, the left main landing gear remained retracted. Following the accident, the airplane manufacturer was in the process of amending the airplane maintenance manual rigging procedures for the landing gear system, and placing service time limits on hydraulic hoses.

Quoted verbatim from the NTSB record.