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9/3/2010 CHAPTER 3. HOLDING POSITION MARKINGS. AC 150/5340-1K 3.1. APPLICATIONS OF HOLDING POSITION MARKINGS. The purposes for the different holding position markings are to prevent aircraft and vehicles from entering into critical areas associated with a runway and navigational aids or to control traffic at the intersection of taxiways. This advisory circular describes six operational situations (cases) using three different holding position marking schemes. Cases 1, 2, and 3 employ the same
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  9/3/2010 AC 150/5340-1K CHAPTER 3. HOLDING POSITION MARKINGS.3.1.APPLICATIONS OF HOLDING POSITION MARKINGS. The purposes for the differentholding position markings are to prevent aircraft and vehicles from entering into critical areas associatedwith a runway and navigational aids or to control traffic at the intersection of taxiways. This advisorycircular describes six operational situations (cases) using three different holding position markingschemes. Cases 1, 2, and 3 employ the same marking scheme referred to as Pattern A – runway holdingposition marking. Cases 4 and 5 employ a different marking scheme referred to as Pattern B – ILS/MLSor POFZ holding position marking. The latter operational situation, Case 5, uses Pattern B in which itusually appears as an L-shaped ladder. Case 6 uses a different marking scheme referred to as Pattern C –intermediate holding position marking for taxiway/taxiway intersections. Figures 12 and 12a show thefour different marking patterns.    Case 1: In terms of taxiing on a runway, an aircraft will need to hold short of an intersectingrunway (see paragraph 3.2).    Case 2: In terms of landing on a runway used for land and hold short operations (LAHSO), theaircraft will need to hold short of an intersecting runway or, in some rare cases, at a specified holdspot on the landing runway (see paragraph 3.2).    Case 3 (most common application for Cases 1, 2, and 3): In terms of taxiing on a taxiway, anaircraft will need to hold short prior to entering an active runway (see paragraph 3.3).    Case 4: In terms of taxiing on a taxiway, an aircraft will need to hold short before entering thecritical area of an Instrument Landing System (ILS)/Microwave Landing System (MLS) (seeparagraph 3.4).    Case 5: In terms of taxiing on a taxiway, an aircraft will need to hold short before entering thecritical area of a Precision Obstacle Free Zone (POFZ) (see paragraph 3.5). Although the surfacemarking pattern is the same as Case 4, the pattern in many applications is L-shaped, instead of only linear in shape.    Case 6: In terms of taxiing on a taxiway, an aircraft will need to hold short of a taxiway/taxiwayintersection (see paragraph 3.6). 3.2CASE 1 AND CASE 2 – APPLICATIONS OF PATTERN A FOR THE RUNWAYHOLDING POSITION MARKING ON RUNWAYS.a.Purpose. Pattern A when painted on a runway, as shown in figure 12, identifies the locationwhere a pilot (or vehicle driver) is to stop and hold when (1) the runway is operationally closed for aninterval of time so that ATCT can control taxiing operations through a runway/runway intersection or (2)the runway is used for land and hold short operations (LAHSO). For necessary corresponding signageand lighting provisions, see AC 150/5340-18, Standards for Airport Sign Systems, and AC 150/5340-30,Design and Installation Details for Airport Visual Aids.23  9/3/2010AC 150/5340-1K RUNWAY THRESHOLDBAR (WHITE)START OF RUNWAYDISPLACED THRESHOLDRUNWAY SHOULDERRUNWAY DEMARCATIONBAR, YELLOW, 3' [1M] WIDE,PAINTED ON TAXIWAYTAXIWAYTAXIWAY CENTERLINE (YELLOW)TAXIWAY EDGE MARKING(2 PER SIDE) (YELLOW) Figure 9. Markings for Aligned Taxiway Preceding a Displaced Threshold 69
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