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Illustrated technical information covering Vol 2 Over 800 multi-choice systems questions Close up photos of internal and external components Illustrated history and description of all variants of 737 Databases and reports of all the major 737 accidents & incidents History and Development of the Boeing 737 - MAX General flightdeck views of each generation of 737's Technical presentations of 737 systems by Chris Brady Detailed tech specs of every series of 737 A collection of my favourite photographs that I have taken of or from the 737 Press reports of orders and deliveries Details about 737 production methods A compilation of links to other sites with useful 737 content Study notes and technical information A compilation of links to major 737 news stories with a downloadable archive A quick concise overview of the pages on this site


A Texas based company called Aero Design Labs, formed in 2017, has just received their FAA STC for an Aerodynamic Drag Reduction System, known as ADRS-1, for the 737-700.

ADRS-1 comes as a kit of retrofits for existing 737-700's and includes a revised wing-to-body aft fairing, modified flap track fairing tips, revised aerodynamics around the environmental control system pack ram air exit duct, various new vortex generators and updated wheel-well fairings. Each modification is designed to reduce existing areas of interference and parasite drag.

Some of these modifications, likle the ECS and WW fairings, were addressed by Boeing with the Performance Improvement Package, but many were completely new with ADRS-1.

The kit is made predominantly from composite materials, and weighs 180 lb but only increases weight by 110 lbs after replacement of the original structure. It requires about 150 working hours to install. The kits will be made by Nordam and supplemented by LA Composite.

It is targeted to achieve approximately 1.5% lower fuel burn on the Boeing 737-700. Based on an average price of about $3 per gallon, the reduced drag would bring an estimated $12,000 per month in savings and around 40 tons of emission reductions per aircraft per month. With such savings, Aero Design Labs is hoping that ADRS could eventually rival the 737 winglet retrofit programs.

The STC (ST09929AC) is initially only for the 737-700 but Aero Design Labs is hoping to install the ADRS-1 kit on the 737-800/-900 by the end of 2022.


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*** Updated 14 Nov 2021 ***

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