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The lower lobe of the glide slope, modulated at a frequency of 150 Hz, lies on the ground surface. This reflects the waves forming incorrect glide paths (equisignals) which are above the ICAO recommended 3 degree glide slope angle. As hinted in the previous sentence, the false slopes always form above the real glide slope. These false slopes are in the order of multiples of three with the first one forming at a 6 degree angle and the other at a 9 degree angle and so on.To avoid entering one of these glide slopes, the normal procedure for an ILS approach is to catch the glide slope from below. Some airports however, guides aircraft to capture the glide path from above with the help of ground radar. The pilots are expected to verify the integrity of the descent by constant monitoring of approach plates, marker beacons and the DME.

My brother in law once worked at an airport as part of the ground crew that performs air craft maintenance. He told me this story about Qantas airline. I can not directly verify the authenticity of the information, so please take it with a pinch of salt.There is a requirement in place by almost every aviation authorities across the world where air crew fills out a specific form that notifies the ground crew of any electrical / mechanical defects found during the flight. They call it “gripe sheet”. It’s a serious business. Mechanics and technicians have to address every issue listed in the sheet. Nonetheless Qantas maintenance crew had some good sense of humor.(P - Problem listed by the pilot / air crew)(S - Solution offered by maintenance crew)P: Left inside main tire almost needs replacement.S: Almost replaced left inside main tire.P: Test flight OK, except auto-land very rough.S: Auto-land not installed on this aircraft.P: Something loose in cockpit.S: Something tightened in cockpit.P: Dead bugs on windshield.S: Live bugs on back order.P: Autopilot in altitude-hold mode produces a 200 feet per minute descent.S: Cannot reproduce problem on ground.P: Evidence of leak on right main landing gear.S: Evidence removed.P: DME volume unbelievably loud.S: DME volume set to more believable level.P: Friction locks cause throttle levers to stick.S: That's what they're there for.P: IFF inoperative.S: IFF always inoperative in OFF mode.P: Suspected crack in windshield.S: Suspect you're right.P: Number 3 engine missing.S: Engine found on right wing after brief search.P: Aircraft handles funny.S: Aircraft warned to straighten up, fly right, and be serious.P: Target radar hums.S: Reprogrammed target radar with lyrics.P: Mouse in cockpit.S: Cat installed.P: Noise coming from under instrument panel. Sounds like a midget pounding on something with a hammer.S: Took hammer away from midget.

Qantas Airlines Maintenance ReportsAfter every flight at Qantus Airlines, pilots fill out a form called a gripe sheet,which conveys to the mechanics problems encountered with the aircraft during the flight that need repair or correction. The mechanics read and correct the problem, and then respond in writing on the lower half of the form what remedial action was taken, and the pilot reviews the gripe sheets before the next flight.Here are some actual logged maintenance complaints and problems as submitted by Qantas pilots and the solution recorded by maintenance engineers.By the way, Qantas is the only major airline that has never had an accident.(P = The problem logged by the pilot.)(S = The solution and action taken by the mechanics.)P: Left inside main tire almost needs replacement.S: Almost replaced left inside main tire.P: Test flight OK, except auto-land very rough.S: Auto-land not installed on this aircraft.P: Something loose in cockpit.S: Something tightened in cockpit.P: Dead bugs on windshield.S: Live bugs on back-order.P: Autopilot in altitude-hold mode produces a 200 feet per minute descent.S: Cannot reproduce problem on ground.P: Evidence of leak on right main landing gear.S: Evidence removed.P: DME volume unbelievably loud.S: DME volume set to more believable level.P: Friction locks cause throttle levers to stick.S: That's what they're there for.P: IFF inoperative.S: IFF always inoperative in OFF mode.P: Suspected crack in windshield.S: Suspect you're right.P: Number 3 engine missing.S: Engine found on right wing after brief search.P: Aircraft handles funny.S: Aircraft warned to straighten up, fly right, and be serious.P: Target radar hums.S: Reprogrammed target radar with lyrics.P: Mouse in cockpit.S: Cat installed.P: Noise coming from under instrument panel. Sounds like a midget pounding on something with a hammer.S: Took hammer away from midget.