NTSB: China Eastern ERJ145 Runway Excursion Caused by Foreign Object Debris
By Simon Hradecky, The Aviation Herald | Feb. 03, 2017
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A China Eastern Embraer ERJ-145, registration B-3052 performing flight MU2947 from Huaian to Shanghai Hongqiao (China), landed on Hongqiao Airport's runway 18L at 5:25 p.m. L but veered right off the runway, ran across a grassy area and came to a stop with the nose on a taxiway, nose gear collapsed, and both main gear on soft ground. No injuries occurred, the aircraft sustained substantial damage.
A NTSB safety recommentadion released on Feb. 2, 2017 reports, that the cause of the runway excursion was foreign object debris inside the electrohydraulic servo valve (EHSV) that blocked a hydraulic port and caused an uncommanded nose wheel deflection to the left. Prior to the disassembly of the EHSV and discovery of the debris the unit had passed an acceptance test as performed on any newly manufactured unit.
The NTSB reported that a number of pilots use binder brackets instead of the chart holders installed by Embraer to hold their binders (containing charts) etc., these binder brackets not having been approved by Embraer. The binder is directly above the nosewheel steering tiller, the NTSB wrote: "The NTSB is concerned that a binder being held by an unapproved bracket may become dislodged, fall, and strike the tiller, engaging the nosewheel steering system and possibly providing a nosewheel steering input. If this happens during the landing roll, the nosewheel steering input could cause a runway excursion."
The NTSB therefore recommended to study and revise the acceptance tests and to issue an operational bulletin to inform flight crew that the use of binder brackets is not approved and could create a hazardeous situation if the binder becomes dislodged.
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No Injuries Reported in China Eastern ERJ-145 Runway Excursion