# Questions tagged [time]

Use this tag for questions regarding UTC, zulu time, daylight savings time, or flight time.

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### How to calculate the amount of differential cable delay between a four port directional antenna and a single port Omni directional antenna in TCAS II?

I want to select the amount of differential cable delay between the top (4-port directional) antenna and the bottom (1-port Omni-directional) antenna in the TCAS II RBP-7G connector pin. In the ACSS ...
116 views

### Foreign Dual on USA log book?

I am a commercial helicopter FAA pilot with a USA logbook. I specify it's USA because it is in english and as you know with available entries to file that I believe mean something else in Argentina. ...
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### Should turns always be standard-rate?

I know that the turn coordinator has markings that allow you to turn at a particular rate, so you can use the TC and a clock or stopwatch to turn a particular number of degrees. Are you always ...
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9k views

### Is it possible to fly around the world to stay in daylight with a fighter jet?

I was wondering if it is possible for a fighter jet to fly around the world and stay in daylight? For the Southern and Northern Hemisphere, the time and speed of daylight is different during seasons. ...
• 1,168
355 views

### Can three pilots accumulate total flight time while training?

Situation: On an aircraft with a flight deck large enough to fit multiple people, three pilots are onboard. 1 PIC in the left seat, and two certified copilots taking turns flying in the right seat for ...
1 vote
3k views

### What are the differences among ETO, ETA, and ELDT?

We are analyzing the Arrival Manager (AMAN) logs and would like to have an understanding of the difference between Estimated Time for Arrival (ETA), Estimated Time Over (ETO), and Estimated Landing ...
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1 vote
268 views

### How does this instrument in a DA20 measure flight time?

Could you please explain how this counter works (in the picture)? I thought that it starts with propeller (so propeller starts moving so this counter), but seems it registers the pure flight - from ...
• 101
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### What are these 3 stages of twilight?

The extreme left is Day and Extreme Right is Night. In between are those Civil twilight, Nautical and Astronomical Twilight ?
6k views

### Since there's "Zulu" time, is there also "Alfa" time?

In talking about an upcoming flight, I was explaining that all flight planning is done in the background in Zulu time (UTC). I understand that, and it makes sense, and I know that tickets are only ...
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510 views

### What is the difference between "origin date" and "departure date"?

In different sources e.g. OAG's API:s (Application Programming Interface), there are both (scheduled) "departure date" and "origin/origination date". In general (so not ...
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### What does scheduled departure time exactly mean?

I am trying to understand the (sometimes subtle) differences between various terminologies concerning flight schedules. What I find difficult to understand is how exactly the scheduled departure time ...
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### How to calculate Night Flight time for a given flight? [duplicate]

I am currently working on a project (web app) at university to be able to calculate the amount of time spent during night flying. Currently, I have, Departure Lat and Long and Departure Time in UTC ...
• 101
1 vote
840 views

### Should I log flights on separate lines if I park the plane between legs to different airports? [duplicate]

I flew one leg of a cross country, landed, parked, and turned off my engine. I flew the same plane home an hour later. Are these two separate flights and should be logged as such, or can they be ...
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### What does 'EST' at the end of a NOTAM's valid time mean?

In this NOTAM below, the valid time is "2006280446-2007312359EST". EST does not appear in the FAA NOTAM contractions list. I assumed this EST meant "Eastern Standard Time", but ...
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1 vote
103 views

### Is it possible to celebrate a holiday twice by flying from one point on Earth to another? [closed]

It recently came to my attention that the different time zones on Earth could allow for a person to celebrate holidays such as New Years twice by flying from one point to another. Is it possible to ...
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1 vote
50 views

### Flight time between Taipei - Vienna vs Vienna - Taipei [duplicate]

I recently took a flight between Vienna (Austria) - Taipei (Taiwan) and then back Taipei - Vienna. The interesting thing that I don't understand is why it takes longer to fly TPE - VIE than VIE - TPE?...
• 123
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### Are the airspace times of operation days of the week in local or Zulu time?

The margin of the Enroute High sectional H-4 claims that the times of operation of the airspace R-5107K near El Paso are "1400-0300Z, MON-FRI" (and other times by NOTAM). If the days of the week are ...
• 93
397 views

### Which timezone do airspaces that cross a time zone boundary belong to on a VFR sectional?

The Albuquerque VFR sectional claims that the airspace table in the margin use local time, but some of the airspaces in the table cross timezone boundaries. Which timezone do those airspaces belong ...
• 93
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### Difference between ETA and On-Block time?

I see that the definition of the ETA (Estimated Time of Arrival) according to Eurocontrol is: (SESAR) the time computed by the FMS for the flight arriving at a point related to the destination ...
• 1,054
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### What is the correct way for pilots to say the time?

While listening to Air Crash Investigations, the pilots used the 24-hour format in a different way than we do. Example: 07:57 hrs would be said as oh-seven-five-seven hours (which makes it a little ...
• 297
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### What is the meaning of these Lido abbreviations?

Can someone help with the abbreviations and meaning from Lido flight planning: RCONT 5 MIN HLDDST ADDT For each of these abbreviations, the flight plan has fuel and time: I placed a red rectangle ...
234 views

### What date and time definition is used for the second leg of a flight?

Let's take flight BA0015, from London to Syndney, via Singapore. This is data from FlightStats. The first leg has this data: ...
• 267
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### What time zone is used for operating an airplane?

This might be a silly question but my thinking was the following: There has to be a definition of time in an airplane for the logging of data and so on, but what definition would that be assuming a ...
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168 views

### What is the flight time from Beirut to Paris using different aircraft?

If the distance between Beirut and Paris is 1985 miles / 3194.55 km / 1724.92 nautical miles, and a flight using Airbus 320-200 take 4 hours and 40 minutes, how much would it take using the following ...
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### (How) do pilots round the time?

I'm wondering what's the time for pilots. Given the case the watch says 10:00:20 - is it basically 10:00? And when does 10:01 start? Is it past ...
• 123
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### Does a 40 years clean crashes sheet of airliner makes people fear to fly with them because there is bigger pressure on the company? [closed]

I am planning for my 2nd flight. The first flight was in November 2017 from Beirut to Istanbul which took 1h45min. I asked this question on this site, explaining my Phobia to professionals on the ...
• 295
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### What is the maximum legal flight time for single pilots under Part 91/135 operations?

I'm referring to FAA Part 91 and 135 operations (or similar, EASA) and the maximum duration of one single flight (not the maximum duty time per day / week / month). If any, what are the legal flight ...
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### What are the missions of high-endurance aircraft?

What have been the missions of some notable high-endurance aircraft -- ones that can stay airborne for several days. Obviously, high-endurance missions have refueling, food, and human factors concerns ...
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### Are there any apps for easy Part 135 Flight Time and Duty Period calculations? [closed]

I need a solution to quickly and easily assist me in calculating Part 135 duty time. I am a charter broker and presently use estimations for my own consideration, but rely on advice from operators ...
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### What is the exact definition of Taxi Time?

I found some definitions on the web, but they weren't same. Some resources mentioned it is sum of the times the aircraft is moving on the ground with its own engines. Some defined it as the time ...
• 123
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### Under EASA regulations, what constitutes loggable flight time?

It wasn't too hard to find questions and answers here discussing flight time as defined by the US FAA. However, I'm curious about EASA regulations, and if applicable specifically as implemented in ...
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### Can I log any PIC time if my medical certificate is out of date and I haven't flown in 20 years?

I haven't flown in 20 years. My medical certificate is not up to date. Can I log a fam flight with a local instructor?
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### Does Daylight Saving Time affect the flight time?

Say an example flight FRA-LHR, was scheduled say 9am every day. Now will that flight be then moved to 10am once the change to DST happens or will it remain at 9am? I would expect the flight times ...
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321 views

### How to calculate flight time from time at full throttle?

I'm building an electrically powered paraglider, and I'm trying to reach one hour of flight time. I've resolved to using 2 18-kilowatt motors. I could use one 35-kilowatt motor, but I'd wrather not ...
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### Why is a sweeping second hand required for IFR?

The reasons why a clock is necessary for IFR have been explained elsewhere, but I haven't seen the reason that the clock has to have a sweeping second hand. It seems like when timing things it would ...
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### How to calculate estimated flight time?

I am trying to calculate estimated flight time accurately. I calculate the distance with the great-circle distance method. I have some specifications of the aircraft such as max speed, cruise speed, ...
226 views

### What causes the average speed difference between the JFK to DEN flights and the JFK to LAX flights?

I just realized shortest JFK - DEN flights are ~4h40m (280 min) and shortest JFK - LAX flights are ~6h (360 min). I'm talking about currently available commercial flights. NY - DEN (straight line) ...
• 123
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### How much earlier/later is sunrise/sunset at 40,000 feet?

If I'm over New York City, and sunrise is 6am, I will see the sunrise earlier when I'm at 40,000 feet on the plane. I think that latitude plays a role here, but using NYC as an example, how much ...
• 241
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### Is there an official FAA source for time zone of an airport?

Looking at this answer, from TypeIA, to the question How to get timezone from airport code (IATA/FAA) . This person is recommending the NASR database, which is good because it's official FAA stuff, ...
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### Why are fighter jets rated differently than passenger jets?

Recently I watched a video on the economics of running an airline. They mentioned that passenger planes have a life span rated in cycles. That got me thinking because as far as I know, fighter jets ...
801 views

### How do pilots fight jet lag?

Jet lag, medically referred to as desynchronosis and rarely as circadian dysrhythmia, is a physiological condition which results from alterations to the body's circadian rhythms resulting from ...
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### Which one is considered the departure time of a commercial flight?

I was wondering, the publicly announced departure time of a commercial flight, is it the ETOT (estimated takeoff time) or is it the EOBT (estimated off-block time)? Or maybe some other time?
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### How can LMT be converted to UTC time?

I am trying to solve some problems on converting from LMT (local mean time) to UTC (coordinated universal time) for flight planning purposes and I have some doubts. The problem is the following: If ...
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1 vote
928 views

### Is there a standard time zone for flight schedules? [duplicate]

I was reading a question on Travel.SE. The asker was asking whether the time on his ticket was in Daylight Savings Time or in standard time. I would imagine flight schedules are supposed to be time-...
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### How much time does a landing/take-off add to an otherwise direct flight?

I'm interested to know how much time a descent and ascent to cruise altitude takes as part of a longer journey. A standard jet-aircraft (for example a A340 or 777) flies for eight hours from City A to ...
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### Hobbs vs Tach time? [duplicate]

Other posts didn't answer my question. In A&P school months ago they told us the difference and can't find where I wrote this down. One of them was used to find engine time and the other was used ...
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### Time Tracking: Does Turboshaft count towards Turbine time?

another edit To clarify - I'm programming an application for logbook tracking and want to automate turbine time calculations to help people fill in insurance firms easily. edit: I guess a more ...
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### Why does aviation use Zulu time instead of the local time?

When reading aviation literature, it's common to find references to Zulu Time. What is Zulu Time? Why does aviation use Zulu Time instead of the local time?
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### What factors besides tail/headwinds cause the time taken to fly some routes to be different from the time it takes to return?

I've observed this on many flight trackers; the time taken to fly from A to B is not necessarily the same as the time taken to fly back from B to A. Why is this so and what external factors besides ...
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