Just like lighting there are also many signs that aid pilots to maneuver there way along the airport.
TYPES OF AIRPORT SIGNS
Mandatory instruction sign – They have white inscription, a black outline and a red background.They show runway/runway intersections, taxiway/runway intersections, (I.L.S) i.e Instrument Landing System critical areas, military landing zones,(P.O.F.Z) i.e Precision Obstacle Free Zone boundaries, runway approach areas, CAT II/III areas of operation & no entry areas.
- Hold position sign for taxiway/runway intersection – Signifies entrance to a runway from a taxiway. in above picture “15-33” signifies that the threshold for runway “15” is to the left side & the threshold for runway “33” is to the right side.
- Hold position sign for runway/runway intersections – They are similar to signs used for taxiway/runway intersections but in this case signifies intersecting runway.
- Holding position Sign for runway approach area – signifies the area set aside for aircraft approaching or departing runway.
- Holding position sign for ILS/POFZ – Signifies Instrument Landing System critical areas & Precision Obstacle Free Zone.
- No entry sign – this signifies the prohibited areas for aircraft.
- Visual runway taxi-holding position sign – signifies the visual taxi-holding Position.
- Holding position signs for CAT I/II/III operations – Category I, II, and III refer to the three categories of the instrument Landing System approach. single & light twin propeller aircraft are only certified to fly CAT I ILS approaches, CAT II is for commercial airline aircraft’s while CAT III is used for airliners.
Information signs – This have a yellow background with black inscription and are used to aid the pilot with extra information like location, direction & destination. This signs use international Morse code phonetic alphabet as follows i.e Alpha, bravo, charlie, delta, echo, foxtrot, golf, hotel, india, juliet, kilo, lima, mike, november, oscar, papa, quebec, romeo, sierra, tango, uniform, victor, whiskey, x-ray, yankee, zulu.
Location signs – This signify location of a specific location or route. They include :-
- Taxiway location sign – it shows which runway you are on i.e taxiway alpha.
- Taxiway ending sign – shows end of a taxiway. i.e end of taxiway alpha.
- Specific location sign – Used to denote specific location inside the airport.
- Runway location sign – This sign shows the runway on which your aircraft is located.
Direction sign – This have black inscription yellow background . They denote direction of taxiways that lead out of an intersection.
- Direction sign for runway exit – i.e in below sign taxiway bravo is approaching from the left. This can be any letter from Morse international code i.e a letter & arrow.
Destination Sign – have a yellow background, black inscription & arrows.
- Outbound destination sign – shows direction to take off runway. it may be a single number like 33 and an arrow or two numbers like 27 & 33, this are denoted as 27.33 with an arrow as shown bellow. This signifies that take off runway 27 & 33 are to the right. when a hyphen is used it indicates specific direction to take of runway.
- Inbound destination sign – directs pilots to specific destinations on the airport. i.e in below example shown direction to military ramp area. it can also be FBO i.e fixed base operator, apron & fuel destinations as below.
- Direction & location signs – This comprises of a directional sign mixed with a location one. in the case below the pilot is on taxiway alpha & taxiway charlie passes from right to left and alpha continues ahead to the right. This is a direction sign array.
- Holding position and location sign – This comprises of a holding position sign mixed with a location one. This signifies holding position 9 for category II/III at specific location G2.
- Taxiway Location Sign & Runway Holding Position Sign – Comprises of a taxiway location sign mixed with a runway holding position sign. in picture below the sign depicts you are on Taxiway Tango & you are nearing the runway 18-36 holding position marking.
- Runway vacated & location sign – used to denote a specific vacated runway i.e at the bottom runway kilo is vacated.
Boundary signs – This denote boundary areas in the airport.
- ILS critical boundary sign – instrument landing system critical areas have boundaries as shown below.
- Runway boundary sign – shows end of runway boundary.its denotes end of RSA i.e runway safety area, OFZ i.e obstacle free zone and runway approach area.
- Taxiway ending marker sign- Shows taxiway doesn’t
Do not proceed contact ATC Sign – Used to caution the pilot where not to enter without contacting Air traffic control. it has black inscription with white background. it is basically a sign with letters.
Stop sign – this is a common sign and resembles the road stop sign. It is an octagon with white inscription red background.
Yield sign – this is a sign in the airport that looks like an inverted triangle with a triangular hole in the middle. it is used to denote give way.
Distance remaining signs – This are the signs that show the pilot the distance remaining to the runway end.