TCF( Terrain Clearance Floor）是啊啥意思？

张杰 · 发表于 2010-4-5 13:42:02

尊敬的各位机务大哥、大姐们，虚心请教一下电子领域的TCF( Terrain Clearance Floor）是啊啥意思？谢谢！

小丛 · 发表于 2010-4-5 14:06:21

AMM描述如下，楼主自己看吧
Description

Terrain clearance floor (TCF) alerts the flight crew when the airplane descends too low on approach. TCF uses airplane position and a runway database to find if there is an alert condition.

Terrain Clearance Floor Inputs

The ground proximity warning system (GPWS) receives airplane data from these systems:

Global positioning system (GPS)

Air data inertial reference system (ADIRS)

Radio altitude (RA) system.

TCF uses this data:

Latitude

Longitude

Radio altitude.

TCF uses GPS data for latitude and longitude. It uses IRS data if GPS data is not valid.

Terrain Clearance Floor Logic

The GPWC has a runway database in memory. The runway database is in the terrain database. The runway database contains the location of all hard surface runways in the world that are longer than 3,500 feet. TCF makes a terrain clearance envelope around the runway. The altitude of the envelope increases as the distance from the airport increases. GPWC compares airplane latitude, longitude, and radio altitude with TCF envelope data. If the airplane descends through the floor of the envelope, the GPWC makes an alert.

TCF makes an alert even if the airplane is in landing configuration.

The TCF function is active through the entire flight. When the aircraft is 15nm or more from a runway the floor is 700 feet AGL until the aircraft approaches another runway that meets the requirements. Then the floor decreases as shown on the graphic.

Terrain Clearance Floor Alert

If the GPWC finds that the airplane is below the TCF, it makes this caution alert:

Aural message TOO LOW TERRAIN. This message repeats for each 20 percent loss of altitude.

Message, TERRAIN on the ND in amber.

If descent continues, these alerts happen:

Aural message PULL UP

Message, TERRAIN on the ND in red

Message, PULL UP on the PFD.

The GPWC inhibits TCF alerts for any of these conditions:

Airplane is on the ground

Less than 20 seconds after takeoff

Less than 30 feet radio altitude.

cafchuyan · 发表于 2010-4-6 22:44:16

我们一般把TCF称为最小地形间隔

nuer · 发表于 2011-6-19 11:16:15

很详细嘛

satyr · 发表于 2013-9-14 13:00:55

最小地形间隔

boxing108 · 发表于 2013-10-8 23:05:43

增强型进近警告系统的一个功能，地形净空基底，就是有一个跑道数据库，再拿飞机的位置高度进行比较如果有危险就发出警报！考执照的树上有，m11的461页

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[B777] TCF( Terrain Clearance Floor）是啊啥意思？