Air Carrier flight crew reported that while taxiing on Taxiway ED; they crossed hold short lines approaching Runway 17R without clearance. Flight crew stated the airport surface was covered in snow; the hold line is reportedly not depicted on the Jeppesen 10-9 chart and there is no signage to indicate where the hold line is.
Synopsis
Air Carrier flight crew reported that while taxiing on Taxiway ED; they crossed hold short lines approaching Runway 17R without clearance. Flight crew stated the airport surface was covered in snow; the hold line is reportedly not depicted on the Jeppesen 10-9 chart and there is no signage to indicate where the hold line is.
Narrative
Following a landing on Runway 17L in DEN; we were instructed by ground to taxi via P7; ED; hold short of Runway 17. As we turned westbound onto Taxiway ED; the Captain was taxiing at a very conservative taxi speed for the given conditions. These taxiways were contaminated with patchy snow/ice. Not quite at the halfway point; while westbound on ED; I reached up to start the APU and while doing this Ground Control instructed us to hold short of Runway 17R Approach. I had my 10-9 Taxi Diagram up with GPS location (not AMM). I immediately referenced the airport diagram and there were no markings at all on Taxiway ED displayed until just past Runway 17R which we weren't close to. I felt the Captain apply braking and he verbalized we were past it and braking was ineffective. ATC told us to 'Stop.' It wasn't until I looked at the AMM that I saw there was a hold line depicted with a *Spot 37* depicted right on it. Again nothing on the 10-9 page. Only on the AMM. Ground Control cleared us to the ramp uneventfully. Without a doubt; the buck stops with us. There are several things here worth noting that contributed to this situation. Although Runway 17R threshold hold line is painted on the taxiway on ED. East of Runway 17R; it is not depicted anywhere on the Jepp 10-9 Airport diagram. (It is depicted on the AMM; but there is also a big circle 37 on the marking on the AMM) In addition; there is no signage on either side of the taxiway.On this particular day; there was significant compacted snow on Taxiway Echo Delta (ED); which made it difficult to initially see the painted marking on Taxiway ED. After pulling into the gate; I pulled up the 10-9 to go over it again. There is a hotspot depicted at the threshold line on the west side of Runway 17R; with a note describing the hotspot and its potential to cross it; but nothing about the threshold on east side. Another factor in this situation was; although the Captain was going at a very conservative; appropriate speed; the instruction to hold short of the 17R threshold was given very shortly before we approached the threshold line while westbound on ED. Due to the patchy snow and ice; even though brakes were applied; the aircraft could not come to a stop in time. Like I said; at the beginning; without a doubt; the buck stops with us; but I just wanted to point out some conditions on this particular day and lack of the marking on the JEPP 10-9 which caused additive conditions on this particular day.
Second reporter narrative
We landed on 17L. Upon clearing the runway; we were instructed to taxi via P; P7; ED; hold short of the Runway 17R Approach. As it was the day after a winter storm passed through DEN and the temperatures were still well below freezing; the taxiways were contaminated with patches of dry packed snow. We were taxiing at around 17 knots on ED. As we approached the hold short marking for the 17R Approach; Ground Control restated; 'Hold short of the 17R Approach. Right at that time I started braking to hold short. The aircraft was slow to decelerate so I applied more braking effort. Just short of the hold line the braking action went to NIL and the aircraft was not slowing down even with maximum braking effort applied. We ended up sliding through the hold short line and came to a stop about 1 aircraft length past the hold short markings. Right after we came to a stop Ground Control cleared us the rest of the way to the Gate via ED; L; CS. We reported the NIL braking on ED at the approach hold short to Ground Control via the Ramp Controller.Even though I was taxiing at a pretty slow speed it was still too fast for the unexpected NIL braking that was encountered. Taxiing even slower would have helped prevent this error.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.