Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- Airbus forecasts that almost three times more aircraft needs to be produced by year 2044 June 12, 2025
- Paris Air Show preview: Don’t look for big news June 11, 2025
- P&W: the troubled GTF will be the best engine for the next single-aisle airplane June 11, 2025
- Boeing’s 737 North Line and the Everett factory: in transition now June 9, 2025
- Bjorn’s Corner: Air Transport’s route to 2050. Part 25. June 6, 2025
Bjorn’s Corner: Keeping airliners operational. Part 8
By Bjorn Fehrm
June 09, 2017, ©. Leeham Co: This week we continue our analysis of the operator’s maintenance plan we made last week for our tentative airline.
Our airline is using Airbus A320s as our operational airplane. For these aircraft we have completed a maintenance plan based on the aircraft OEM’s Maintenance Planning Document (MPD) as well as other regulatory requirements.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
Bjorn’s Corner: Keeping airliners operational. Part 7
By Bjorn Fehrm
June 02, 2017, ©. Leeham Co: We last week got an understanding of the maintenance task types that a Maintenance Planning Document (MPD) for the Airbus A320 contains.
We now use this knowledge to build an operator’s maintenance program for our A320-based airline.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
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Bjorn’s Corner: Keeping airliners operational. Part 6
By Bjorn Fehrm
May 26, 2017, ©. Leeham Co: Last week we looked at a maintenance plan for a common aircraft, the Airbus A320. We learned how typical maintenance tasks were described in the aircraft’s Maintenance Planning Document (MPD). It’s the central document the aircraft OEM issues that describes the minimum recommended maintenance for the aircraft to keep it airworthy.
Each operator builds its own maintenance plan for the aircraft, in cooperation with its local Airworthiness authority. The MPD is then a base input for the plan. Before we go into how such a plan can look, we describe the principal MPD task types that such a plan contain.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
Bjorn’s Corner: Keeping airliners operational. Part 5
By Bjorn Fehrm
May 19, 2017, ©. Leeham Co: Last week we described the different working groups and review committees and boards involved in defining a new airliner’s maintenance requirements.
We now continue with describing a practical maintenance task from the maintenance plan for a common aircraft, the Airbus A320.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
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Bjorn’s Corner: Keeping airliners operational. Part 4
By Bjorn Fehrm
May 12, 2017, ©. Leeham Co: Last week we explained how maintenance philosophies were developed for airliners, from Maintenance Steering Group one (MSG-1), through to Maintenance Steering Group 3 (MSG-3), today’s standard.
The way in which today’s complex systems shall be analyzed should be top down instead of bottom up. And safety concerns should be separated from economical considerations.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
Now we will go through what this means in practice. We will develop a maintenance plan for a new aircraft, according to the latest standards.
But first, the structure of the work we have in front of us.
Bjorn’s Corner: Keeping airliners operational. Part 3
By Bjorn Fehrm
May 5, 2017, ©. Leeham Co: We will now continue the series on keeping airliners operationally fit with how modern methods for maintenance programs were developed.
In the first article, we described hard-time maintenance limits and how these did not really produce a reliable and safe aircraft. They cost a lot, however. We also described how a first step to a modern maintenance philosophy was developed around the Boeing 747.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
Bjorn’s Corner: Keeping airliners operational. Part 2
By Bjorn Fehrm
April 20, 2017, ©. Leeham Co: We will start the second article in series on keeping airliners operational by discussing how the structure is kept fit.
There are three areas that are more key to flight safety of an airliner than others. The aircraft’s structure, the engines (already discussed) and the flight control system. We will start with the structure.
Figure 1. The first modern maintenance program was formed around the Boeing 747. Source: Wikipedia.
Bjorn’s Corner: Keeping airliners operational
By Bjorn Fehrm
April 20, 2017, ©. Leeham Co: We expect our flights to depart on time and with 100% safety. At the same time, the aircraft is used up to 14 hours and flies up to 5-6 missions a day.
This means 1,800 flights a year. As airliners will last 25 years, we talk about 45,000 flights with 99.7% dispatch reliability and 100% safety.
It’s clear the aircraft must be cared for in a special way. We’ll discover how.
Figure 1. The first modern maintenance program was formed around the Boeing 747, here at the roll out in 1968. Source: Wikipedia.
Bjorn’s Corner: Aircraft engines, sum up
By Bjorn Fehrm
April 14, 2017, ©. Leeham Co: We’ve been talking engines on Fridays since October 2016. The Corners covered several areas, from technologies to operations.
And we could go on and dig deeper. But we will move on.
Before we go, we sum up what we have learned in the 24 Corners around airliner Turbofans.
Figure 1. Principal picture of a three-shaft wide-body turbofan. Source: GasTurb.
Bjorn’s Corner: Aircraft engine maintenance, Part 6
By Bjorn Fehrm
April 7, 2017, ©. Leeham Co: Last week’s Corner developed the overhaul shop visits per year for wide-body engines. We will now look at how the market develops around these overhaul opportunities.
How does the shop structure develop over a popular engine’s life-cycle? How much choice has an operator and when?
Figure 1. Principal picture of a three-shaft wide-body turbofan with station numbers. Source: GasTurb.