MLS Flashcards
MLS
MICROWAVE LANDING SYSTEM
DISADVATNGES FOR ILS
ONLY 40 CHANNELS
LACALIZER AND GLIDEPATH REQUIRE LONG,STRAINGHT IN APPR
NO SPEICAL APP FOR SLOW OR LIGHT /c
Subject mulitpatch
3 ground based transmitter
Azimuth unit(AZ)
Back azimuth unit (BAZ)
Elevation unit(EL)
Paired DME/P
Operates in the SHF frewuncy band
Up to 200 channels on asssigned frequency
Identified using a 4 letter code ,starting with M( in morese code)
Airboneequipment
Muliti mode reciver (MMR) allows tuning of ILS ,MLS and gps approach
Indicaotr (same ILS)
Azimuth Coverage and range
40 degree either side
At 20 nm
A narow beam scans each sector TO and FROM
An a/c wihtin the beam is painted twice ,once in each sweep
The time interval between the two retuns gives an accurate
Horizon tal and vertical
Even in departure (using back approach)
Segment approach needs a flight director and FMS
Wihtout DME/P ,can be flown only straight
Adavantages
~built in dme
~back coarse