B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Fatigue; Human-Machine Interface; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
General Maintenance Action
Aircraft; Human Factors
On short Final upon selecting landing gear handle down the RH Main Gear Down Light was not illuminated. Conducted a lights TEST and verified light bulbs were inoperative. Elected a go-around to further troubleshoot and run the associated checklist. Aircraft was maintained in positive control and flight profile was done well. Informed ATC of problem and requested vectors for extended downwind for time management. Taking into consideration previous experience on this aircraft of the same light bulbs being burnt out during preflight checks; the crew agreed the issue was a false indication. However; we also inappropriately concluded the Gear Unsafe Checklist was not appropriate and failed to blow the gear down in accordance with correct procedure. We were tired; more concerned with flying the plane and convinced of a false indication. We were ultimately proven right with an uneventful and nice landing.
Once established at a safe altitude; a short discussion ensued about a lack of other warnings such as Gear Disagree EICAS; GPWS Too Low Gear; Gear Warning Horn with Flap setting beyond 20 selected and lightbulb test with no bulbs lit on right main gear. Pilot flying called for the non-normal checklist. After a short discussion to ensure correct non-normal checklist was selected; we referenced the Gear Disagree non-normal checklist. Second approach and landing was safe and uneventful. After block-in; it became apparent that the Gear Disagree Checklist [had not been] fully completed [and a] discrepancy was noted in aircraft maintenance logbook...... In addition; a lack of adequate rest facilities in combination with the long stage-length contributed to our failure to complete the non-normal checklist in its entirety. The current rest facilities onboard our 767 fleet is inadequate. At best; they have 10 degrees of recline with no way to elevate legs and feet.
After noting that neither light bulb in the Right Main Gear green light had illuminated; fatigue and the conviction that the lack of additional expected alerts caused the flight crew of a B767-300ER to land uneventfully without completing the Gear Disagree non-normal checklist.