时间：2011-04-18 00:47来源：蓝天飞行翻译 作者：航空 点击：次
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e. Distance Measuring Equipment (DME)1. When installed with the ILS and specified in the approach procedure, DME may be used: (a) In lieu of the OM; AIM (b)As a back course (BC) final approach fix (FAF); and (c)To establish other fixes on the localizer course. 2. In some cases, DME from a separate facility may be used within Terminal Instrument Procedures (TERPS) limitations: (a)To provide ARC initial approach seg-ments; (b)As a FAF for BC approaches; and (c)As a substitute for the OM. f.Marker Beacon 1.ILS marker beacons have a rated power output of 3 watts or less and an antenna array designed to produce an elliptical pattern with dimensions, at 1,000 feet above the antenna, of approximately 2,400 feet in width and 4,200 feet in length. Airborne marker beacon receivers with a selective sensitivity feature should always be operated in the “low” sensitivity position for proper reception of ILS marker beacons. 2.Ordinarily, there are two marker beacons associated with an ILS, the OM and MM. Locations with a Category II ILS also have an Inner Marker (IM). When an aircraft passes over a marker, the pilot will receive the indications shown in TBL 1.1.3. (a)The OM normally indicates a position at which an aircraft at the appropriate altitude on the localizer course will intercept the ILS glide path. (b)The MM indicates a position approxi-mately 3,500 feet from the landing threshold. This is also the position where an aircraft on the glide path will be at an altitude of approximately 200 feet above the elevation of the touchdown zone. (c)The IM will indicate a point at which an aircraft is at a designated decision height (DH) on the glide path between the MM and landing threshold. TBL 1.1.3 Marker Passage Indications Marker Code Light OM BLUE MM . AMBER IM .... WHITE BC .... WHITE Navigation Aids 1.1.9 3. A back course marker normally indicates the ILS back course final approach fix where approach descent is commenced. g. Compass Locator 1.Compass locator transmitters are often situated at the MM and OM sites. The transmitters have a power of less than 25 watts, a range of at least 15 miles and operate between 190 and 535 kHz. At some locations, higher powered radio beacons, up to 400 watts, are used as OM compass locators. These generally carry Transcribed Weather Broadcast (TWEB) information. 2.Compass locators transmit two letter identifi-cation groups. The outer locator transmits the first two letters of the localizer identification group, and the middle locator transmits the last two letters of the localizer identification group. h. ILS Frequency (See TBL 1.1.4.) TBL 1.1.4 Frequency Pairs Allocated for ILS Localizer MHz Glide Slope 108.10 334.70 108.15 334.55 108.3 334.10 108.35 333.95 108.5 329.90 108.55 329.75 108.7 330.50 108.75 330.35 108.9 329.30 108.95 329.15 109.1 331.40 109.15 331.25 109.3 332.00 109.35 331.85 109.50 332.60 109.55 332.45 109.70 333.20 109.75 333.05 109.90 333.80 109.95 333.65 110.1 334.40 110.15 334.25 110.3 335.00 110.35 334.85 110.5 329.60 110.55 329.45 Localizer MHz Glide Slope 110.70 330.20 110.75 330.05 110.90 330.80 110.95 330.65 111.10 331.70 111.15 331.55 111.30 332.30 111.35 332.15 111.50 332.9 111.55 332.75 111.70 333.5 111.75 333.35 111.90 331.1 111.95 330.95 i. ILS Minimums 1. The lowest authorized ILS minimums, with all required ground and airborne systems components operative, are: (a)Category I. Decision Height (DH) 200 feet and Runway Visual Range (RVR) 2,400 feet (with touchdown zone and centerline lighting, RVR 1,800 feet), or (with Autopilot or FD or HUD, RVR 1,800 feet); (b) Special Authorization Category I. DH 150 feet and Runway Visual Range (RVR) 1,400 feet, HUD to DH; (c)Category II. DH 100 feet and RVR 1,200 feet (with autoland or HUD to touchdown and noted on authorization, RVR 1,000 feet); (d)Special Authorization Category II with Reduced Lighting. DH 100 feet and RVR 1,200 feet with autoland or HUD to touchdown and noted on authorization (touchdown zone, centerline lighting, and ALSF.2 are not required); (e)Category IIIa. No DH or DH below 100 feet and RVR not less than 700 feet; (f)Category IIIb. No DH or DH below 50 feet and RVR less than 700 feet but not less than 150 feet; and (g)Category IIIc. No DH and no RVR limitation. NOTE. Special authorization and equipment required for Categories II and III. 1.1.10 Navigation Aids j. Inoperative ILS Components 1.Inoperative localizer. When the localizer fails, an ILS approach is not authorized. 2.Inoperative glide slope. When the glide slope fails, the ILS reverts to a nonprecision localizer approach. REFERENCE. See the inoperative component table in the U.S. Government Terminal Procedures Publication (TPP), for adjustments to minimums due to inoperative airborne or ground system equipment. |
