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Powered Aircraft Log Report #

Introduction #

The Powered Aircraft Log Report is mainly intended for aircraft logkeeping and determination of maintenance requirements. For more financially orientated reporting of powered aircraft activity see the Transaction Summary Report, particularly Table: Launches and Table: Power flying.

This report includes all of the flying by each of the powered aircraft operated by the club: in particular the tugs and motor-gliders. This includes aerotow launches and off-tow (O/T) flying. Aerotow retrieves are not reported separately but included in the O/T totals.

The data entered into Max for O/T flying depends on the particular aircraft involved. This is determined by the charging rules, particularly the chocks-input, flight-input, tacho-input and hobbs-input fields. Together with the presence or otherwise of aerotows there are a lot of possible combinations of applicable data for an aircraft. Rather than have a very wide table, only columns applicable to a particular aircraft in the month are printed.

Report Options #

The Powered Aircraft Log Report is printed for a single month - the current month. There are no options to print for other periods of time.

When the report is selected for printing a small options dialog box is shown:

The report can be printed for all powered aircraft for which flight data was entered during the month or for just a single aircraft. If the report is printed for all aircraft there is an option to put the tables for each on a separate page.

The tables for the individual aircraft are produced in alphabetical order of registration.

Data Accumulation #

The first report generation step is to scan all of the glider and power flight transactions for the month accumulating the following information for each powered aircraft on each day:

The first two fields apply to the tug for glider flight transactions. The remaining fields apply for powered flights, including aerotow retrieves. The number of miles for aerotow retrieves is not used. Where the charging rules indicate that a field is not applicable to an aircraft the values are left at zero, of course.

Even if a tug was fitted with a tacho or Hobbs meter there is no option to enter this information for aerotow flights.

Units and Rounding #

The general principles of rounding used in this report are:

Flight counts are simple integers and are added as such. There is no rounding applied.

Aerotow heights are entered in feet (typically, in multiples of one hundred). These are totalled for each aircraft for each day, rounded up to the next multiple of 200 feet then converted to time at the rate of 0.01 hours per 200 feet (equivalent to 6 minutes per 2000 feet).

Times can be entered in hours and minutes or hours and decimals of an hour (see Power Flying Logsheet Entry). The handling of times is as described in Time.

With the exception of the logged airframe and, if applicable, logged engine times, all times are printed to full precision (that is, without rounding). For the total aerotow time the preferred (and only possible) format is hours and decimals.

The logged airframe and, if separate, engine times are rounded up to the next multiple of 0.1 of an hour to make it convenient to keep the paper logs. However, the club aircraft usually do short flights and often only a few on a day so this rounding up could be significant in the long run. Therefore, a running total of the amount of round-up applied is kept and is subtracted from the total for the next day. This is carried forward across the days of a month but not from one month to the next.

The processes applied for each of the airframe and engine times are the same:

In the odd case where an aircraft actually flies less than the borrowed time (e.g., it just does one low tow) then the logged time is set to zero and the borrowed time is decreased by the flight time.

Column Selection #

Airframe Time #

One of the input fields for the aircraft log is selected to determine the airframe time depending on the fields configured in the charging rules to be input (e.g., flight-input). The first available of:

If none of these are available and there is any off-tow flying for the aircraft an error is reported. If none are available and the aircraft only towed then flight time is used, it'll be zero for O/T time anyway.

Engine Time #

Similarly, one field is used to determine the engine time, the first available of:

If none are available the flight time is used. Again, it'll be zero anyway.

Depending on the aircraft, the time used for the engine may or may not be the same as that used for the airframe. Typically, tugs have no "run-time" instruments and the total tow height and logged O/T flight times are used for both the airframe and the engine. Motorgliders are more likely to have Hobbs and/or tacho used for the airframe and engine respectively.

General #

In general, columns are included if their contents contribute information on how the logged totals for the airframe and, if separate, the engine are calculated.

Under which circumstances a column is present is shown under When Present in the table below.

Table Details #

The table for each aircraft can have either two or three rows of of headings. These are described below as the top, middle and bottom rows. The top row is only present if different values are used for the engine and airframe time. The middle and bottom rows are always present.

Column Contents When Present Bottom Heading Middle Heading Top Heading
Day Day of month Always Day
Tows Number of tows Tows present Tows Tows
Tow Height Total aerotow height in feet Height
Tow Time Total aerotow time calculated from height Time
Flights Number of O/T flights Always Flts O/T
Hobbs Start Lowest Hobbs start time of the day * Hobbs time used for airframe or engine time Start Hobbs
Hobbs End Highest Hobbs end time of the day End
Hobbs Time Total Hobbs time of the day * Time
Tacho Start Lowest tacho start time of the day * Tacho time used for airframe or engine time Start Tacho
Tacho End Highest tacho end time of the day End
Tacho Time Total tacho time of the day * Time
Flight Time Total O/T flight time for the day Flight time used for airframe or engine time Time O/T
Chocks Time Total chocks time for the day Chocks time used for airframe or engine time Chocks Time or Time O/T or Chocks
Total Flights Total number of tows and O/T flights Tows present Flts Total
Airframe Total Time Total O/T and aerotow airframe time Time Total Airframe
Airframe Borrowed Time Airframe time round up carried forward to the next day Always Time Borrowed
Airframe Logged Time Airframe total time minus brought forward borrowed time, rounded up to the next 0.1 hour Time Logged
Engine Total Time Total O/T and aerotow engine time Tows present and airframe and engine separate Time Total Engine
Engine Borrowed Time Engine time round up carried forward to the next day Airframe and engine separate Time Borrowed
Engine Logged Time Engine total time minus brought forward borrowed time, rounded up to the next 0.1 hour Time Logged

(*) For tacho and Hobbs values, the start time fields are prefixed with an asterisk if they don't match the end time of the previous day. Total time fields are similarly prefixed if they don't match the difference between the start and end times of the day. These can happen if flights are missed, times are entered incorrectly or the are minor reading differences. They're worth having a second look at but not necessarily serious problems.

The choice of heading for the chocks time field depends on whether there are any tows present for the aircraft.