Passed Citation X Type Ride Today!

[rfresh]

>Now you can sit on .92, and if you pull the right circut breaker, even a bit faster.

What does pulling that circuit breaker do?

 

[X man]

that circut breaker

Gets rid of that annoying beep when your red Mach number tape goes red do to a bit of turbulance at the higher altitudes. According to Cessna test pilots, the aircraft has done Mach, the airframe does not seem to have a problem, it is the engines and the super sonic air entering the intakes. I would not read to much into all this, just something you pickup after sitting in the seats for awhile.

 

[rfresh]

I see.

Reminds me when I was instructing on the 727 with a major airline back when. A 727 (TWA) crew pulled a CB so they could climb higher than what the performance page showed they could at their present weight.

When the second officer pulled the CB, the pilots selected flaps 2. On the 727, the first flap setting of 2 degrees sends the flaps *back* a lot more than *down*. So you can get an increase in wing area with little drag from the flaps being 'down'.

Well, up they went and at some point they stalled out and fell out of the sky in uncontrolled flight. At the last possible moment, the Captain put the gear down and that created enough drag to slow the a/c enough for him to regain control.

They were able to land successfully but with severe structural damage to the 727.

After that event, I remember having to teach our 727 pilots exactly what happens to the 727 system when you do that and then tell them not to do that!

 

[mvedepo]

Great. Doing the work of the Cessna Test pilots so they don't have to.

SS

Trust me, they've done it!

 

[goodgig]

I thought the FE pushed the breaker in when he saw it out, and the flaps extended; or is that a different story?

 

[Buckeye]

Was that the one with Hoots Gibson?

 

[viper548]

Cessna decided on .92M for a very good reason.

 

[NJA Capt]

Cessna decided on .92M for a very good reason.

No. The FAA decided on that limit.

Certification requires a .07 buffer below the max sustainable speed. The highest sustainable max speed without being supersonic is .99M. No subsonic civilian aircraft can be certified with a higher Mmo than 0.92M unless the FAA decides to narrow its buffer. The SSBJ and QSST plan to be certified above 1.0M, allowing them to fly subsonic speeds over land between .92 and .98

 

[viper548]

Thanks NJA Capt. .07 is a pretty large buffer

 

[T206driver]

Please don't get caught breaking rules and bending metal. Congradulations Captain.