Unanswered Questions

694 questions with no upvoted or accepted answers
16
votes
1answer
521 views

Why does the F-15 have a swept-back trailing edge at its wing tips?

The F-15's wing has an curious feature: a swept-back trailing edge near the wingtips, along with an unswept inboard portion of the wing. (Modified from https://en.wikipedia.org/wiki/...
11
votes
0answers
210 views

Why is the weather radar mounted on the left wing of the TBM?

Weather radar is mounted starboard on the Pilatus PC12 or in the Piper Meridian/M600/M500. It adds drag to the right wing, thus a right yawing moment, and helps to counteract the slipstream effect ...
10
votes
0answers
185 views

How does an eILS improve throughput (for the A380)?

While researching where Heathrow's MLS approachs had gone, the only thing I could find is a topic on Heathrow's new eILS (enhanced ILS). As of the topic's date (Aug 2015) it seems eILS is only ...
10
votes
1answer
214 views

May a student continue a discontinued checkride if the CFI who endorsed them voids that endorsement?

The Situation CFI Charlie endorses Student Sara's logbook for a checkride. Sara begins the checkride but discontinues, and receives a letter of discontinuance. So far so good. Before Sara can ...
8
votes
2answers
581 views

Would a coaxial propeller with the second prop slower and larger improve speed?

Looking at various propeller designs, I started wondering about these limitations: Large propellers at high speeds have tips going supersonic Scimitar props attempt to keep prop tip from going ...
8
votes
1answer
403 views

Can the RAM AIR valve cause depressurization on the CRJ-900?

On the CRJ-900 AIR-CONDITIONING panel there is a RAM AIR switch light which opens a valve and allows air from the ram air scoop to enter the mixing manifold for distribution to both the flight deck ...
8
votes
1answer
866 views

What is the willingness of non-AME/pilot physicians to perform BasicMed exams?

May 1st, 2017, BasicMed rolls out and for certain operations and certain pilots BasicMed promises a much more permissive and yet preventive oriented approach to medical approvals for pilots. A ...
8
votes
1answer
400 views

What was the Trim Problem on the Brabazon's First Flight?

In this video, starting at 18:15, the copilot on the Bristol Brabazon's first flight recounts that the aircraft became airborne a little sooner than its pilots expected, and that despite the captain ...
7
votes
0answers
188 views

What is the correct IATA airplane designator for the Boeing 787-10?

Wikipedia claims 781, most other sources say 78J. I can't find anything authoritative, and IATA has the gall to want US$578 for ...
7
votes
1answer
266 views

What is the primary reason that the non-towered airports KACV and KTLV have E4 extensions to E2 airspace?

NOTE-- this question is not about why it was desired to protect the airspace that ended up within the E4 "extensions". Rather, this question is about why that was done by designating that airspace as ...
7
votes
1answer
218 views

Why does obstacle clearance area splay outward instead of being a rectangle?

I am having trouble figuring out the logic behind the way that obstacle clearance areas are constructed. Take, for example, a departure procedure where Initial Climb Area is defined in TERPS (section ...
7
votes
1answer
260 views

Why must a pilot enter “Upwind” when entering the traffic pattern for RWY 9 at Linden (LDJ) airport in New Jersey?

The chart supplement procedures require aircraft to enter the traffic pattern "Upwind" for Runway 9 at Linden (LDJ) airport in New Jersey. Question: Why is this required? Chart Supplement: New York ...
7
votes
1answer
386 views

In a part 91 formation flight within a mode C veil, are all the aircraft required to have their transponders on?

Two aircraft are planning on conducting a standard formation flight (aircraft remaining within 1 mile of each other) as follows in the U.S.: Maintaining VFR below 10,000 MSL; Remaining outside/clear ...
7
votes
0answers
66 views

Why are some US STAR fixes/waypoints included in FAA's legacy files but not in FAA's published STAR procedures?

I have noticed that some US STAR procedures include (slightly) different number of waypoints, depending on which source material is consulted. Take for example the CAMRN4 STAR and its corresponding ...
7
votes
0answers
72 views

How is a 14 CFR 101 sUAS NOTAM filed for an unregistered aircraft?

FAA promotes the utilization of NOTAMs to announce sUAS operations, and requires it in 333 exemptions and some 107 waivers. However, sUAS (drones / model aircraft) under 14 CFR 101 have been ...

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