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Air carrier first officer pointed out the ambiguity of approach procedures when combining RNAV approach with ILS at rno.
| Attributes | |
| ACN | 1377405 |
| Time | |
| Date | 201607 |
| Place | |
| Locale Reference | RNO.Tower |
| State Reference | NV |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 224 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Inflight Event / Encounter Unstabilized Approach |
Narrative:
So this is regarding a general concern for safety relating to the newly created ILS Z 16R in reno.we flew into reno on a VMC day and executed this approach under visual conditions. Enroute I read everything I could find about this new approach and I either didn't find or there isn't guidance on the procedures the crew should use in switching from the RNAV portion of this approach to the ILS portion. If the ILS minimums are required; you have to switch at some point. When do we set zero? When do we switch to localizer then app modes?I know there is guidance on being in app mode for the ILS by the FAF. This was of particular concern to me because if we had been IMC and planned on switching to approach right before discs so the LNAV and VNAV could have taken us through most of it; we would have found that the VNAV path was approximately 3/4 dot high on the G/south signal. In fact; other than a brief moment; when it arrived at the 7500 mandatory at zombo; we were above the G/south the whole time. This would require uncommon intervention to fix.anyway the point is this is a new hybrid kind of approach into a mountainous airport and I don't feel many of us would know exactly how to handle it. I'm glad we were VMC.
Original NASA ASRS Text
Title: Air carrier First Officer pointed out the ambiguity of approach procedures when combining RNAV approach with ILS at RNO.
Narrative: So this is regarding a general concern for safety relating to the newly created ILS Z 16R in Reno.We flew into Reno on a VMC day and executed this approach under visual conditions. Enroute I read everything I could find about this new approach and I either didn't find or there isn't guidance on the procedures the Crew should use in switching from the RNAV portion of this approach to the ILS portion. If the ILS minimums are required; you have to switch at some point. When do we set zero? When do we switch to LOC then app modes?I know there is guidance on being in app mode for the ILS by the FAF. This was of particular concern to me because if we had been IMC and planned on switching to Approach right before DISCS so the LNAV and VNAV could have taken us through most of it; we would have found that the VNAV PATH was approximately 3/4 dot high on the G/S signal. In fact; other than a brief moment; when it arrived at the 7500 mandatory at ZOMBO; we were above the G/S the whole time. This would require uncommon intervention to fix.Anyway the point is this is a new hybrid kind of approach into a mountainous airport and I don't feel many of us would know exactly how to handle it. I'm glad we were VMC.
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.