GalaxyFlyer wrote:I’ve never seen a plane with one.
WPvsMW wrote:Yes, IIRC, the ground call "horn" (GND or GND CALL) is like a car horn and is LOUD, but momentary. The warble tone is a cooling system failure, and continues until cleared.
stratclub wrote:Ground call is a pretty standard function these days. It is used when someone in the cockpit needs to talk to someone on the ground. It does have other functions as in when ground power power is shut down and the Adiru reverts to battery when AC power is lost when power ground power is shut down without switching off the Adiru's first.
I have no idea what "horn" your are referring to.
WPvsMW wrote:Airbus types also have a "ground call", call MECH on the instrument panel. It is so soft I wouldn't call it a horn ... more of a buzzer.
https://www.pprune.org/tech-log/300851- ... -horn.html
I'm puzzled by the what a/c uses the ACP in https://i.stack.imgur.com/4cZxI.png
The switches look like switches used in Avtech's modules, which are used in many Citations, but the ACP in the photo doesn't look like a Citation panel.
747Whale wrote:Actually reaching the external APU control panel is another matter...
747Whale wrote:It's too high to reach on quite a few, especially if the aircraft isn't loaded enough to compress the gear.
VSMUT wrote:They are on all ATRs, officially it's the mechanics call. On older ones they sound like the horn on an older French or Italian car, and are quite loud. We use them to get the attention of the ground and for general shenanigans.
acmx wrote:I agree with the md11 location. Some people would need a ladder and it’s also has an access door with latches that never get used. And it’s definitely not as noticeable as other planes I’ve worked on.
WPvsMW wrote:Pilots: On the ramp? On a taxiway to scare feral cats?
If on the ramp, under what circumstances? No ramper response to request to push?
MX: When yelling out the window at someone with no radio doesn't get their attention, or is wearing ear buds because they just went off shift?
Any rules on using the horn inside a hangar?
Hi: When flying, on cruise, and a peatón do not pay attention crossing a way point.
Acey559 wrote:The 757/767 also has a loud “beep beep beep” horn that indicates an APU fire (same noise as the equipment overheat horn). The ground crew has be ability to shut the APU down and fire a bottle (767) on the panel located on the back of the nose gear.
stratclub wrote:That most likely would be any aircraft with ADIRU's (Air Data Inertia Reference Units) . If you shut off or lost ground power with out shutting off the ADIRU's, the ground call would go off continuously because the ADIRU's were on battery. True as well for the 787's and for the IRS's (Inertia Reference System) on the 747's.
CrimsonNL wrote:The Avrojet has an actual "car horn" sound as the ground call.
747Whale wrote:It's called a landing light.
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