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Originally Posted by N121PP
I was flying on the 777 (my favorite plane) the other day towards the back of the plane and I couldn't help notice the power of those engines on takeoff! Maybe it's mental, but do all jet engines produce the same thrust for the size of the plane? In order words, do you get the same "power" relative to the size of the aircraft? Hope this makes sense. Do you know difference in power or thrust a 777 produces as opposed to your 767-300ER?
The thrust-to-weight ratio can definitely vary from one aircraft type to another. I fly both the 767 and 757 (just flew a 767 to Cairo and tomorrow I fly the 757 to Copenhagen), and there's a very noticeable difference between the two. The 757 has some great performance and also handles more like a sports car compared to the station wagon feel of the 767.
The 777's engines are so powerful that if you have an engine failure after takeoff, you actually have to reduce thrust on the good engine due to the tremendous asymmetric thrust. I've never flown a plane where you pull back the power on the one remaining engine.
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Also on the same flight we were about an hour late leaving the gate and I have some questions:
1. When does the crew time start? When the door is closed or as soon as you report for duty, say an hour before the scheduled flight?
Our duty clock starts one hour prior to the first pushback for domestic flying; 1.5 hours prior to pushback for international. That's not an FAA specified time...it was probably negotiated between the company and the pilot union and based on the amount of time required to review the flight plan and otherwise prepare for the flight.
The block time, which is the time which would go in the pilot's logbook, is the time from which the airplane first moves for the purpose of flight (i.e. does not include simply repositioning the plane on the field) until it comes to its final stop.
Because block time limits are strictly governed by FARs, it's important for us to have some way of marking these times. Different airlines do it different ways. I think I remember hearing that American has something that starts the clock when the nosewheel tire moves. At Delta, the clock starts when the main entry door is closed
and the rotating beacon is on. At the other end, the clock stops when either the beacon is turned off
or the main entry door is opened.
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2. Since we were late, I noticed on taxi to the runway, we must have passed 8 jets that were there before us and proceeded to take off ahead of them. Was that because we were already late or just luck?
There are a couple reasons why this may have happened. One of them is that somehow the company worked out with ATC that priority handling was needed for this flight due to duty time limits for the crew. The other is that the airplanes you passed were heading in a direction that was currently shutdown for departures.
I've seen this 2nd case often at JFK. There may be thunderstorms to the west of NY, shutting down the departure fixes which ATC uses to funnel JFK traffic out of the NY area. Meanwhile, it's clear to the east, so all the international departures are cleared to go.
At La Guardia, they operate strictly on a first-come, first-served basis, with takeoff clearances issued in the order that the planes called ground control for taxi clearance. Thus, we might taxi out from the Marine Air Terminal right next to runway 4 and be the first plane in line and then watch 10 airplanes on the opposite side of the runway takeoff before us because they were already in the pipeline.