| DHC-7 | 7-21-12 | Cabin Pressurization Control and Drainage System - To Overcome Freezing in Severe Cold Conditions
- Modification 711 652
(A/C 1 thru 39) | Mar 20, 1981 | |
| DHC-7 | 7-34-34 | Navigation - Ground Proximity Warning Computer (G.P.W.C.) - Reconfiguration of Altitude Rate Circuitry
(A/C with GPWC Part Number 965-0476-088, Prior to Serial Number 5568) | Sep 19, 1986 | Nov 20, 1987 'B' |
| DHC-7 | 7-27-34 | Flap Control System - Flap Screwjack Tracks No. 2 and 3 - To Introduce an Improved Locking Feature for Aft Bearing Nut and Greasing Provision
- Modifications 7/1591 and 7/1590 (A/C 3 thru 27 - Modification 7/1591; 3 thru 29 - Modification 7/1590) | Sep 4, 1981 | |
| DHC-7 | 7-32-81 | Landing Gear - Flap/Landing Gear Warning Horn Circuit Revision
- Modification 7/2502
(A/C with Modification 7/2202) | Jun 13, 1986 | |
| DHC-7 | 7-31-7 | Communications - Cockpit Voice Recorder
- Rework to Prevent Loss of Input
- S.O.O. 7141
(A/C 54, 62 and 66) | Apr 8, 1982 | |
| DHC-7 | 7-25-27 | Furnishings - Flight Compartment Door - Addition of Latch for Use with Observer's Seat
- Modification 7/1749
(A/C 1 thru 34 with S.O.O. 7026) | Nov 20, 1981 | |
| DHC-7 | 7-57-12 | Left and Right-Hand Wing Ground Spoiler Actuator Attachment Bracket - Inspection and Replacement of Rivets with Bolts
- Modification 7/1827
(A/C 1 thru 30) | Jan 15, 1982 | |
| DHC-7 | 7-24-33 | Electrical System - To Introduce Lever Lock Switches for Master Control on A.C. Control Panel Assembly
- Modification 7/1896
(A/C 1 thru 52) | Sep 11, 1981 | |
| DHC-7 | 7-28-4 | Fuel System - Boost Pump Wiring - To Install Protective Sleeve
- Modification 7/1572
(A/C 1 thru 17) | Apr 18, 1980 | Jun 9, 1980 'A' |
| DHC-7 | 7-53-3 | Rear Fuselage - To Improve Stringer Attachments to Frames at Stations X596.75 and X714.50
- Modification 7/1271
(A/C 4, 8 and 9) | Jul 13, 1979 | |
| DHC-7 | 7-21-28 | Air Conditioning - Standardized Outflow Valves Aft Cabin - Pressure System
- Modification 712406
(A/C 1 thru 108) | Apr 4, 1986 | |
| DHC-7 | 7-39-1 | Barometric Standby Altimeter
- Co-pilot's Installation
- Modification 7/1522
(A/C 1, 2, 3 and 7 thru 12) | Sep 28, 1979 | |
| DHC-7 | 7-27-50 | Flight Controls - Ground Spoiler - Rigging Check -
DHC E.O. 72301
(A/C 1 and Sub.) | Jan 28, 1983 | |
| DHC-7 | A7-32-97 | Landing Gear - Initial Inspection and Test of Hydraulic Selector Valve Sterer
Part Number 57420 or 57420-3
Serial Numbers 3 thru 110 without Modification 7/2516 | Nov 10, 1992 | |
| DHC-7 | 7-32-12 | Nose Landing Gear - Replacement of Shock Strut Assembly Upper Bearing
- Modification 7/1575
(A/C 1 thru 7, 9, 10 and 11) | Jun 8, 1979 | |
| DHC-7 | 7-25-43 | Furnishings - Improved Aft Fuselage Under-Floor Access
- Modification 7/1352 (A/C 3 thru 27) | Jun 10, 1983 | |
| DHC-7 | 7-57-28 | Wings - Application of Corrosion Inhibitor to Upper Wing Skin and Heat Shields
- Modification 7/2506
(A/C with Modification 7/2414) | Apr 17, 1987 | |
| DHC-7 | 7-24-49 | AC Electrical System - Voltage Suppressors and Relays Replacement
- Modification 7/2092 (A/C 1 thru 112) | Feb 25, 1983 | Mar 22, 1985 'A' |
| DHC-7 | 7-28-20 | Fuel - Pressure Relief and Dump Valve - Installation of New Switch Assembly, Gaskets and Seals
- Modification 7/2580
(A/C with Pressure Relief and Dump Valve Part Number 2800015-101 Installed) | Mar 10, 1989 | |
| DHC-7 | 7-53-20 | Upper Airstair Door - Improve Access to Microswitch
- Modification 7/1865
(A/C 1 thru 72) | Sep 25, 1981 | Feb 19, 1982 'A' |
