Narrative:

On final approach; EICAS indicated a status message 'landing gear monitor.' the first officer referenced the cockpit operation manual and no abnormal procedure was noted. We referenced the 'status message' supplemental procedure and made a note of the message. The landing gear indicator lights indicated that the gear were down and locked although only 1 bulb in each indicator was illuminated. We felt comfortable continuing the landing based on the indications we had. Upon landing; only the left thrust reverser deployed and the spoilers did not deploy automatically. The aircraft yawed to the left (more than seemed normal with only 1 reverser deployed). It also felt like the aircraft was leaning toward the left. We thought that possibly the left main tires had failed; so we elected to stop on the runway and called for the emergency equipment. After stopping; we noticed that the landing gear manual override button; which should be extended on the ground; was not extended. We had the emergency crew check the brake temperatures and then had our company come out; pin the landing gear; and tow us to the gate. The passengers were deplaned normally at the gate. After a later conversation with our fleet training captain; I learned that this situation was caused by a card failure in the landing gear monitor system. We currently have no specific procedure for this occurrence but if I ever encounter it again; I would go around and attempt to contact the company (dispatch and/or maintenance control) for any guidance they might have. While I felt comfortable continuing the landing with the indications we had; it would be best to consult another resource to obtain any additional information. Supplemental information from acn 819007: only 1 light bulb per 'gear down' indicator illuminated. Assessed aircraft safe to land. Upon landing; the air/ground sensor remained in flight mode on one landing gear monitor system. Therefore; only the left wing autospoilers deployed; autobrakes disarmed; and only left reverse operated. The aircraft listed to the left but we did not know why at the time. We thought tires blew or the gear strut collapsed. We asked tower for information. They said smoke was coming from right gear. Emergency vehicles were summoned. Aircraft assessed to be safe. By that time; flight deck indications were also assessed and with the aircraft sensing flight mode; the gear lever lock pin was not engaged. Therefore; we had maintenance pin the gears and tow us to the gate. Aircraft was then deplaned normally.

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Original NASA ASRS Text

Title: B757 flight crew reports LANDING GEAR monitor status EICAS message after gear extension during approach. After landing spoilers and reversers do not deploy on the right side and the auto brakes trip off. Aircraft is towed to the gate.

Narrative: On final approach; EICAS indicated a status message 'Landing Gear Monitor.' The First Officer referenced the Cockpit Operation Manual and no abnormal procedure was noted. We referenced the 'status message' supplemental procedure and made a note of the message. The landing gear indicator lights indicated that the gear were down and locked although only 1 bulb in each indicator was illuminated. We felt comfortable continuing the landing based on the indications we had. Upon landing; only the left thrust reverser deployed and the spoilers did not deploy automatically. The aircraft yawed to the left (more than seemed normal with only 1 reverser deployed). It also felt like the aircraft was leaning toward the left. We thought that possibly the left main tires had failed; so we elected to stop on the runway and called for the emergency equipment. After stopping; we noticed that the landing gear manual override button; which should be extended on the ground; was not extended. We had the emergency crew check the brake temperatures and then had our company come out; pin the landing gear; and tow us to the gate. The passengers were deplaned normally at the gate. After a later conversation with our Fleet Training Captain; I learned that this situation was caused by a card failure in the landing gear monitor system. We currently have no specific procedure for this occurrence but if I ever encounter it again; I would go around and attempt to contact the company (Dispatch and/or Maintenance Control) for any guidance they might have. While I felt comfortable continuing the landing with the indications we had; it would be best to consult another resource to obtain any additional information. Supplemental information from ACN 819007: Only 1 light bulb per 'gear down' indicator illuminated. Assessed aircraft safe to land. Upon landing; the air/ground sensor remained in flight mode on one landing gear monitor system. Therefore; only the left wing autospoilers deployed; autobrakes disarmed; and only left reverse operated. The aircraft listed to the left but we did not know why at the time. We thought tires blew or the gear strut collapsed. We asked Tower for information. They said smoke was coming from right gear. Emergency vehicles were summoned. Aircraft assessed to be safe. By that time; flight deck indications were also assessed and with the aircraft sensing flight mode; the gear lever lock pin was not engaged. Therefore; we had Maintenance pin the gears and tow us to the gate. Aircraft was then deplaned normally.

Data retrieved from NASA's ASRS site as of May 2009 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.