First officer of a part 121 large turbojet reported experiencing a sink rate warning during the last...

Attributes
ACN	1551556
Time
Date	201806
Local Time Of Day	1801-2400
Place
Locale Reference	DCA.Airport
State Reference	DC
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 412
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

While flying the RNAV runway 19 at dca; we received the sink rate warning at about 500 ft. AGL. I was flying the aircraft. I reduced the sink rate and continued the approach and landing. The aircraft was stable at 1000 ft. The altitude bug was set at 600 ft. Because of the 550 ft. Decision altitude. The glide slope guidance leveled off at 600 ft.; and I momentarily followed the guidance; driving the aircraft above glide slope. We quickly recognized the deviation; and I increased the sink rate to get back on glide slope. This increase in sink rate triggered the 'sink rate' warning. I immediately reduced the sink rate and continued the approach and landing visually; using the VASI for glide slope guidance.

Original NASA ASRS Text

Title: First Officer of a Part 121 large turbojet reported experiencing a sink rate warning during the last phases of an RNAV approach.

Narrative: While flying the RNAV Runway 19 at DCA; we received the SINK RATE warning at about 500 ft. AGL. I was flying the aircraft. I reduced the sink rate and continued the approach and landing. The aircraft was stable at 1000 ft. The altitude bug was set at 600 ft. because of the 550 ft. decision altitude. The glide slope guidance leveled off at 600 ft.; and I momentarily followed the guidance; driving the aircraft above glide slope. We quickly recognized the deviation; and I increased the sink rate to get back on glide slope. This increase in sink rate triggered the 'sink rate' warning. I immediately reduced the sink rate and continued the approach and landing visually; using the VASI for glide slope guidance.

Data retrieved from NASA's ASRS site 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.

First officer of a part 121 large turbojet reported experiencing a sink rate warning during the last phases of an RNAV approach.