An emb-145's retraction/extension hydraulic lines were catching on the auxiliary gear drag brace was...

Attributes
ACN	1080276
Time
Date	201304
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Marginal
Light	Night
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Component
Aircraft Component	Nose Gear
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 4500
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

Test flight was scheduled for aircraft post mbv (main base visit). Flight was conducted per the fcf (functional check flight) checklist and profile. During the first approach we encountered a loud bang during landing gear extension and then followed by a landing gear handle disagree message (lg/lever disagree) on the EICAS. We executed the missed approach and complied with procedures. After recycling the landing gear per the procedure; the landing gear indicated down and locked on EICAS and was verified on rmu. We commenced our approach and landed uneventful. Aircraft was stopped on the runway due to loud bang in flight and was towed off runway by maintenance.initial reports indicate the retraction/extension hydraulic lines were catching on the auxiliary gear drag brace washer and preventing the nose gear from extending. Have maintenance reroute hydraulic lines away from the auxiliary gear drag brace washer.

Original NASA ASRS Text

Title: An EMB-145's retraction/extension hydraulic lines were catching on the auxiliary gear drag brace washer and preventing the nose gear from extending so an emergency was declared and the aircraft landed uneventfully following a post maintenance Functional Check Flight.

Narrative: Test flight was scheduled for aircraft post MBV (Main Base Visit). Flight was conducted per the FCF (Functional Check Flight) checklist and profile. During the first approach we encountered a loud bang during landing gear extension and then followed by a Landing Gear Handle Disagree Message (LG/LEVER DISAGREE) on the EICAS. We executed the missed approach and complied with procedures. After recycling the landing gear per the procedure; the landing gear indicated down and locked on EICAS and was verified on RMU. We commenced our approach and landed uneventful. Aircraft was stopped on the runway due to loud bang in flight and was towed off runway by Maintenance.Initial reports indicate the retraction/extension hydraulic lines were catching on the auxiliary gear drag brace washer and preventing the nose gear from extending. Have Maintenance reroute hydraulic lines away from the auxiliary gear drag brace washer.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

An emb-145's retraction/extension hydraulic lines were catching on the auxiliary gear drag brace washer and preventing the nose gear from extending so an emergency was declared and the aircraft landed uneventfully following a post maintenance functional check flight.