Air carrier flight crew reported a taxiway incursion was the result of confusing verbiage identifying the ILS hold short line as an intermediate hold on the airport diagram.
Synopsis
Air carrier flight crew reported a taxiway incursion was the result of confusing verbiage identifying the ILS hold short line as an intermediate hold on the airport diagram.
Narrative
When taxiing out to Runway 30 on Taxiway L at LGB; we were told by ATC (LGB Ground Control) cleared to cross the Runway 26L approach hold line; but to hold short the Runway 30 ILS critical area. Both pilots verbally agreed on Ground Control's instructions; but we failed to point out the exact location of where the ILS hold short line is on the airport diagram. We thought the ILS hold short line for Runway 30 would be close to the end of the runway. On the airport diagram; the ILS hold short line is labeled as an intermediate hold; not the ILS hold short line. On the EFB (Electronic Flight Bag); you can see it looks more like the ILS hold line; but it's not labeled. Following this event; we looked more closely at the airport diagram and EFB and noticed you can see it clearly only when fully zoomed in on the EFB. Ground Control also didn't give us any warning that the ILS critical area was abeam the Runway 30 displaced threshold instead of closer to the runway.ATC wanted us to hold short of the ILS hold line/taxied past clearance point. The airport diagram should label the ILS hold short line instead of the intermediate hold. Ground Control could be more descriptive of the location when giving instruction to hold short. This could also be noted in the LGB company information pages under taxi out. Just to give other crews a heads up that this could be a clearance given when taxiing out to Runway 30.
Second reporter narrative
Taxied past clearance limit of ILS hold-short line on Taxiway L on way to departure Runway 30. Ground Control instructed us to taxi to Runway 30 via Taxiway L; hold short of ILS hold-short line. Both pilots verbally agreed on what Ground Control's instruction; but did not discuss the actual location of the ILS hold short line. I assumed that the ILS hold-short line was close to the runway threshold at the approach end of the runway; prior to the runway hold-short line; as in most airports. The ILS hold-short line is labeled as 'intermediate hold' on the airport diagram; but the graphic does not look like an ILS hold-short line. Following the event; both Pilots looked more closely at the EFB (Electronic Flight Bag) and noticed the graphic that does resemble an ILS hold-short line; but only when zoomed in to maximum zoom. The physical ILS hold-short line was not plainly obvious on Taxiway L. Ground Control did not give any amplifying instruction such as; 'Hold short of the ILS hold-short line; abeam the displaced threshold for Runway 30.'The airport diagram should label it as 'ILS hold-short line;' rather than 'intermediate hold.' The EFB should depict it more clearly and specifically. Ground Control should be more descriptive regarding its location when issuing instructions.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.