c5load From United States of America, joined Sep 2008, 917 posts, RR: 0 Posted (4 years 1 month 1 week 6 days 14 hours ago) and read 3870 times:
While spotting takeoffs from the UPS end of runway 27 at PHL, I got the opportunity to see several of the evening trans-atlantic departures of the 762. As they took off and I was able to see the back of the airplane, every one only had the left wing strobe flashing. There was no right wing strobe. Was it coincidence that they may have been burnt out on all the airplanes I saw or do they not have a right wing strobe light?
"But this airplane has 4 engines, it's an entirely different kind of flying! Altogether"
Fly2HMO From , joined Dec 1969, posts, RR:
Reply 1, posted (4 years 1 month 1 week 6 days 13 hours ago) and read 3843 times:
Quoting c5load (Thread starter): Was it coincidence that they may have been burnt out on all the airplanes I saw or do they not have a right wing strobe light?
I think you were just at the wrong viewing angle. The strobes can be obscured easily from some angles even though they're supposed to be omnidirectional. Seen it happen in other planes from the ground as well. All wing strobes must be operational per the FARs.
FlyDeltaJets87 From , joined Dec 1969, posts, RR:
Reply 2, posted (4 years 1 month 1 week 6 days 12 hours ago) and read 3819 times:
Quoting c5load (Thread starter): As they took off and I was able to see the back of the airplane, every one only had the left wing strobe flashing. There was no right wing strobe. Was it coincidence that they may have been burnt out on all the airplanes I saw or do they not have a right wing strobe light?
I flew in a 767-200 at night from ATL to PDX and I had a window seat on the right side of the plane and I'm pretty sure I recall the strobe flashing the entire flight.
etherealsky From United States of America, joined Apr 2010, 328 posts, RR: 0
Reply 6, posted (4 years 1 month 5 days 2 hours ago) and read 3174 times:
Boeingfixer is correct. The actual requirements straight from 14 CFR § 91.205 (Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements.)
Airline ops obviously fall under IFR; this excerpt is from the "Night VFR" equipment section, all of which is required for IFR ops.
(2) Approved position lights.
(3) An approved aviation red or aviation white anticollision light system on all U.S.-registered civil aircraft. Anticollision light systems initially installed after August 11, 1971, on aircraft for which a type certificate was issued or applied for before August 11, 1971, must at least meet the anticollision light standards of part 23, 25, 27, or 29 of this chapter, as applicable, that were in effect on August 10, 1971, except that the color may be either aviation red or aviation white. In the event of failure of any light of the anticollision light system, operations with the aircraft may be continued to a stop where repairs or replacement can be made.
(4) If the aircraft is operated for hire, one electric landing light.
The applicable 'Airworthiness Standards' chapter for airliners is 25.
Here's what the FAA says about anticollision systems.
(1) Consists of one or more approved anticollision lights located so that their light will not impair the crew's vision or detract from the conspicuity of the position lights; and
(2) Meets the requirements of paragraphs (b) through (f) of this section.
(b) Field of coverage. The system must consist of enough lights to illuminate the vital areas around the airplane considering the physical configuration and flight characteristics of the airplane. The field of coverage must extend in each direction within at least 75 degrees above and 75 degrees below the horizontal plane of the airplane, except that a solid angle or angles of obstructed visibility totaling not more than 0.03 steradians is allowable within a solid angle equal to 0.15 steradians centered about the longitudinal axis in the rearward direction.
(The rest of it deals with color, intensity, flashing frequency, etc.)
So according to that, from a legal standpoint, you just need the beacons OR the strobes operational to satisfy the FARs (they both count as anticollision lighting systems). The manufacturer may or may not require a specific one (or both) of those (according to the KOEL/MMEL), and the airline itself may even be more strict in its own MEL.