# Questions tagged [cessna-172]

The Cessna 172 Skyhawk is a four-seat light aircraft, very commonly used in flight training

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### Are the spring constant and damping coefficient of landing gear publicly available?

I'm trying to find the spring constant and damping coefficient for a Cessna 172. I looked through the POH, but couldn't find them anywhere. Are these values available publicly in some design document ...
211 views

### Cessna 172 Nose wheel steering

The POH states that ground steering is done by a spring loaded bungee system. How exactly does depressing the rudders apply pressure to the system to actually turn the wheel? Thanks
1k views

### How can I calculate the C.G height for an Aircraft?

before I continue I would like to thank you guys beforehand for the help. I am new to this forum and in aviation in general. I am helping my professor to obtain the C.G coordinates in x, y , z for a ...
242 views

### What are the Cessna 172 carburetor icing chart data points?

I am looking for the polynomial equations (functions) for each of the curved lines. I have been looking online and I am unable to find the formulas and the data points for this chart (Cessna 172). I ...
1 vote
77 views

### Main battery is discharging with alternator running [duplicate]

In my Cessna 172S, we had a problem about 'main battery discharge' after an hour of flight. We tried doing wiring test on the connection at the master switch which ran from the alternator and ...
100 views

### What is that inertia that makes the nose rise in a spin?

The Flight Training manual mentions For Ex. 13- spin, that the nose drops due to the loss of lift, and rises due to inertia forces. Can someone explain to me that inertia force making the nose rise, ...
186 views

### How many active registered Cessna 172s are there in each United States state

This is for a school project on different aircraft accidents. (My sources I have been given are the FAA and the NTSB.
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### What causes a Cessna 172 and its gear to shake violently after landing and braking?

I am sure this was due to my own ignorance on proper technique, but immediately after landing in a Cessna 172, I applied brakes and some moderate aerodynamic braking and experienced an awful and ...
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### Why can we not use full throttle in a C172 when cruising at lower altitudes?

My flight training manual (FTM) says that at low altitudes we throttle back our trainers in order to not exceed recommended power settings. We use the Lycoming O-320 engine. But why is that? Is the ...
3k views

### Why is the initial short-field climb below Vₓ in a Cessna 172?

Short-field takeoff procedure for a Cessna 172R is Wing Flaps – 10°. Brakes – APPLY. Throttle – FULL OPEN. Mixture – RICH … Brakes – RELEASE. Elevator Control – SLIGHTLY TAIL LOW. ...
238 views

### Airspeed indication in a forward slip C172?

I have read several topics on the manner with two completely different answers, and just want to make sure I get it right. When slipping to the right in a C172 (right aileron, left rudder), the static ...
6k views

### Why does the Cessna 152/172 nose wheel turn only when the aircraft is moving?

According to the POH, ground control is achieved by a spring loaded steering bungee. But how does it work and why the nose wheel does not move when the aircraft is stationary?
7k views

### Is there anything extra required to spin a Cessna 172 in the Utility category?

I'm trying to find a suitable aircraft to get my spin endorsement for my CFI rating but am running into trouble with most aerobatic aircraft due to my height (too tall). My last thought is that I ...
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### Why does the trailing edge have a more pronounced taper than the leading edge on the Cessna 172?

Why does the Cessna 172 have a more pronounced taper on the trailing edge as opposed to the leading edge?
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### Cessna 172S model starting procedure

I just recently started flying a fuel injected cessna after flying carb heated M and P models, and have a question about the starting procedure- particularly about the “warm start”. when we start the ...
556 views

### How many master cylinders are there in a typical dual brakes Cessna 172?

After searching in the AFMs of the several C172 my flight school operates, all of them describe the system very basically with no diagrams, as exemplified in the following picture: Is there one ...
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### Cessna 172: at which RPM should the oil pressure reach the green arc?

I am part of a team developing a Cessna 172 P model for FlightGear, an open source free flight simulator. We are now trying to improve the oil pressure and temperature simulation, and we have a ...
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### Is it possible to install a bike rack on a Cessna 172?

I stumbled upon a nice photo manipulation on aviationhumor.net. Source My question is short and concise: Is it practically possible to do that? Is it okay in terms of aerodynamics, weight, CG? ...
1 vote
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### How is half of the wing strut (high wing) [or half the aileron (low wing)] a good reference to estimate gliding distance? [closed]

Through training and still to this day, I keep on using these reference points to judge if I am at the right distance from the runway or the field I aim to land at (forced landing).
1 vote
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### What is the longest recorded nonstop flight made in a Cessna 172 without receiving external fuel?

What is the record for the longest flight (by either time or ground distance covered) made in a Cessna 172 without obtaining fuel from an external source after take-off? Extra fuel tanks are fine, as ...
10k views

### Why did Cessna get rid of manual flaps in their 172?

At the club I fly at, there is an older Cessna 172 that has a manual "Johnson Bar" that is used to put the flaps down. In the newer 152, and I believe the rest of the planes (I have yet to fly them), ...
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### When should the throttle be closed on a C172 while landing?

during landing training in a cessna 172, would you rather cut the power to idle at beginning of runway threshold, or idle when you're close to ground? I keep having problems where I flare too high or ...
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### What could cause uneven fuel levels in a Cessna 172?

I went for a 1.5 hour flight in a 1977 Cessna 172N, with several takeoffs and landings. I was alone. When I left, I had 18 gallons in each tank. When I arrived back, I had 15 gallons in the left tank, ...
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### Are there Cessna spare parts supplier in South East Asia? [closed]

I am living in South East Asia, and thinking of buying a reconditioned Cessna 172. Are there any spare parts supplier here that I could purchase , or do I need to order from US ?
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### What happens if you put car gas in an airplane?

If I understand correctly, small planes like the Cessna 172 use 100 octane leaded gasoline with no ethanol. What would happen if you put regular unleaded car gas with ethanol in one?
1 vote
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### How fast can a Cessna 172 taco?

What is the highest speed at which a Cessna 172 can taxi without lifting off the ground? If you removed the wings, how fast could it taxi? (Answers only answering the first part are fine; I doubt the ...
591 views

### Why is there a a nose-up pitching tendency during a forward slip in a Cessna 172?

Why is there a tendency for the nose to pitch-up during a forward slip in a Cessna 172 (According to the TC Flight training manual)? Quote: "If full rudder is used, considerable aileron pressure ...
718 views

### Testing magnetos during engine failure

I'm a student pilot (PPL) and the C172 I fly has the following item in the emergency checklist for in-flight engine failures: MAGNETOS...............TEST My ...
3k views

### Why does the main battery discharge with the alternator running?

In my cessna 172S, when engine running at any RPM, the current at the main battery is below zero, indicating that the alternator is not charging the battery or the battery discharges, but the standby ...
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### Turbulence from hot weather?

My introduction flight was canceled because of "the turbulence due to heat". They called half an hour before the time of the flight (Cessna 172). I'm okay to reschedule it but I'm a bit ...
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### What type of ailerons does the C172P have?

Today during the mock ground session with my instructor he asked what type of ailerons does the C172P have. I looked in section 7 of the POH and all I was able to find was "Conventional hinged ...
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### What is a Cessna 172's maximum altitude?

What is the maximum altitude at which a Cessna 172 can fly?
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### Does the fuel selector switch of a Cessna 172 automatically turn 180° when pulling fuel shut off?

I noticed this behaviour in X-Plane 11 using the LR Cessna model and I'm wondering if this resembles the correct behaviour of a real aircraft. Also it seems that in X-Plane after pulling the fuel shut ...
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### How do I appropriately choose the power settings on a C172 for cruise?

Today during the ground portion with my instructor he asked me "why did you choose to cruise at 2300 rpm flying at 1990 ft pressure altitude?" I didn't have an answer for him, and I couldn't ...
1 vote
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### C172N Skyhawk II fuel drain handle operation for people < 180cm

I'm asking for a friend - literally. One of our club's planes is an old workhorse used a lot for training. She's got a fuel drain handle in the inspection hatch where one checks the oil. I've never ...
9k views

### Why should one not slip a Cessna 172 with flaps extended?

The POH strongly recommends not slipping the AC with full flaps...why? It seems natural in a crosswind approach to allow the horizontal lift component to cancel the airmass movement across the ...
132 views

### What is the string antenna on the back of this Cessna 172 for? [duplicate]

Okay, so this question was asked before. But I didn't get the answer I wanted. I read that its some sort of antenna. what is it, what does it do, and how does it work? Also, is it in anyway related to ...
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### What happens if you exceed the maximum speed on a C172?

The airspeed indicator has a red marking that means: "never exceed this speed" ($V_{NE}$, around 160 KIAS). Why can't you exceed that speed?
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### Does this fuel leak from the carburetor of a Cessna 172E need immediate maintenance?

Consider: I'm concerned with a fuel leak I've developed on my Cessna 172E in the past three weeks and appears to be coming from the carburetor. There is even some fuel in the air breather near the ...
2k views

### Why does a fuel-injected engine have a mixture control?

For example, in a C172S fuel injected type, what does the mixture control lever control exactly in the fuel system? They have a fuel air control unit which regulates fuel flow based on air passing ...
1 vote
2k views

### C172 alternator field circuit breaker(5a) vs alternator pull off circuit breaker(55a)

what’s the different with alt circuit breakers between 5a vs 55a?? If alt field circuit breaker pops out does that mean alternator is not producing electricity? And if al current circuit breaker(55a) ...
871 views

### What is the difference between a 1974 Cessna 172 and a Cessna 172M?

Are there any discernible exterior features that are different for a Cessna 172 vs 172M? If a Cessna 172 was made in 1974, is it an "M" series?
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### On the G1000 lean assist page, what does a positive delta EGT mean?

When leaning the fuel mixture on a C172 using the lean assist feature on the G1000, the hottest cylinder's EGT will be displayed, along with a reading showing the difference between the current ...
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### How to compute thrust to weight ratio of a Cessna 172?

Cessna 172 has weight about 1 ton and it's engine produces about 213 Kg of thrust, and it flies great. So if I make a plane with a weight of 100kg including pilot and fuel so will 15 kg thrust good ...
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### Do I need a ferry permit for an alternator repair ferry flight within a mode C veil?

My Cessna 172 SP's alternator died while stationed at a class D airport, less than 10 miles from my home field (another class D). Both airports are within the mode C veil of a nearby B airport. ...
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### Why does a Cessna 172 have dihedral wings if it has high wings?

"Dihedral goes hand in hand with low wing aircraft, and anhedral goes with high wing". This is what I assumed till now. But when I see a Cessna 172, the wings are a little dihedral. So why ...
12k views

### What prevents a small plane like a Cessna or Piper from flying as high as a jet?

Obviously taking oxygen in consideration. What prevents a small plane from being able to fly at a much higher altitude? I know some business jets can fly up to 40,000 ft. Does it have to do with the ...
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### Why does the Cessna 172S Skyhawk use only two blade fixed pitched prop?

Surely it would get more thrust from a three blade variable pitch propeller. From what I've read it's all about the area swept and also should be far enough apart to not cause too much interference. ...