B767 First Officer reported inadvertently descending below the assigned altitude on the approach after misunderstanding a descent clearance. After receiving a gear warning; the crew slowed the descent and continued for landing.

Date: 2023-06 · Aircraft: B767-300 and 300 ER · Phase: approach

Anomalies: Deviation altitude excursion from assigned altitudeDeviation altitude overshootDeviation altitude crossing restriction not metDeviation discrepancy procedural clearanceDeviation discrepancy procedural published material policyInflight event encounter controlled flight toward/into terrain

Synopsis

Narrative

We were being vectored for the approach to Runway X. We had extended the approach off ZZZZZ as our IAF; but ATC then gave us direct to ZZZZZ1. His instructions were direct ZZZZZ1; maintain 3400 ft. until established; cleared for the ILS Runway X. After get established on the approach; the PF (Pilot Flying) put the FAF altitude in; which is ZZZZZ2 at 2300 ft. As we were descending; we received a EICAS warning; CONFIG GEAR NOT DOWN. It came on for a few seconds and the went away. We never received a GPWS as we were both in terrain mode and had the runway insight the during the approach.After ZZZZZ1; we were still descending and got about 300 to 500 ft. low before ZZZZZ. The PF selected VS mode to slow our descent and picked up the GS. We should have maintained at or above 3300 ft. at ZZZZZ and intercepted the GS past that.

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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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