2024-07 · NASA ASRS report 2149133
Air carrier flight crew reported receiving several terrain and bank angle aural warnings during initial climb. Flight crew maintained clear of terrain and continued flight.
ATC assigned a takeoff Heading of 290 from Runway 05 in RDM. In Visual Conditions / Clear Skies; right after Dawn (great visibility); we decided to take a right turn for this Heading...since it matched the same direction /cardinal direction to the engine out procedure. The FO (Pilot Flying) took the right-had turn passing 400 feet A.F.E. and we both had the outside terrain in sight. The Terrain both flying; and before departure; was Not considered a High Threat when making a right-hand turn...with our good rate of climb; lighter aircraft weight (not full of fuel); & low-density altitude. In the turn to HDG (Heading) 290 the First Officer made a steady right bank between 25 - 30 degrees. While keeping this bank angle we had 2 EGPWS (Enhanced Ground Proximity Warning System) aurals go off; once each: 'Too Low; Terrain' & 'Bank Angle'; with a brief 'RA' (Resoultion Advisory) Flag on our PFD (Primary Flight Display) and a transient brief EICAS message that may have said 'Approach 2; not available'.All 4 of these occurrences happened almost together (back-to-back) and then disappeared a couple seconds later. We noticed yellow dotted Terrain (Terrain Map) displayed on our MFD (Multi-Function Display); but never had the aircraft pointing directly towards it; with what seemed like adequate distance; altitude; a good rate of climb; what seemed like a good safety margin away from it; and a consistent bank maintained... in the ATC assigned heading away from it.After the flight we reviewed our Ground Track to see Terrain Proximity to our flight path and are unsure if actual Terrain caused the EGPWS auruals; and what we thought were associated...with the 'RA' flag (no traffic) and transient EICAS message.Possible False Warnings? Suspected Erroneous messages.? It is a bit difficult for us to determine a concrete answer.Possible cause was making a right turn to HDG 290 at 400 feet (even though it was clear skies in VMC condition. Perhaps climbing straight out bit longer (1;000 feet) would have prevented any EGPWS warnings. Another possible cause was the decreasing rate of climb (temporarily) during acceleration altitude.Suggestions: Keeping a good rate of climb. I feel like it should be a personal Standard to maintain 1;000 feet per minute climb anytime Terrain is in the vicinity; regardless of VMC conditions. Perhaps our acceleration (temporary decreasing rate of climb) caused the brief EGPWS warnings...and suspected associated 'RA' flag; etc.
Took off of RWY 5 on IFR flight plan in VMC (flap 4) with assigned left or right heading of 290. We decided a right turn at 400' was the best course of action due to the single engine procedure. After a consistent 25-30 degree bank angle we experienced GPWS (Enhanced Ground Proximity Warning System) aural message shortly after (x2) and bank angle aural message. Dotted yellow terrain was noted within 10 mile scale on MFD (Multi-Function Display). Messages were short lived; (5 seconds or less) all terrain was in sight and not a safety concern. Continued climb over threshold of departure runway to assigned heading. I do not believe our trajectory was ever towards terrain and do not believe safety was threatened during this experience.I believe the cause of this was due to a right turn initiated on RWY 5 at a standard VMC altitude passing through the course of Powell Butte. If we were to level our turn towards this mountain; there could have been a terrain threat. I believe a straight out heading until first radio contact would prevent the alert. Or a recommendation to climb above 1000' prior to initial turn in VMC could achieve a smoother departure.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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