---
title: "Transport Canada issues AD CF-2026-37 TLMC-ALI for DHC-8-401/402 aeroplanes; new or more restrictive ALI tasks"
sdDatePublished: "2026-08-06T15:15:00Z"
source: "https://ad.easa.europa.eu/blob/CF-2026-37-E.pdf/AD_CF-2026-37_1"
topics:
  - name: "air transport"
    identifier: "medtop:20000338"
  - name: "transport"
    identifier: "medtop:20000337"
locations:
  - "Canada"
---


Transport Canada issues AD CF-2026-37 TLMC-ALI for DHC-8-401/402 aeroplanes; new or more restrictive ALI tasks

Airworthiness Directive CF-2026-37- Time Limits/Maintenance Checks (TLMC) – Airworthiness Limitation Items (ALI)

TP 7245E
1 of 5
AD Number: CF-2026-37

AIRWORTHINESS DIRECTIVE
This Airworthiness Directive (AD) is issued pursuant to Canadian Aviation Regulation (CAR) 521.427.
No person shall conduct a take-off or permit a take-off to be conducted in an aircraft that is in their legal
custody and control, unless the requirements of CAR 605.84 pertaining to ADs are met. Standard 625 -
Aircraft Equipment and Maintenance Standards Appendix H provides information concerning alternative
means of compliance (AMOC) with ADs.
Number:
CF-2026-37
ATA:
05
Effective Date:
4 September 2026
Type Certificate:
A-142
Subject:
Time Limits/Maintenance Checks (TLMC) – Airworthiness Limitation Items (ALI)
Applicability:
De Havilland Aircraft of Canada Limited (DHC) (Formerly Bombardier Inc.) model DHC-8-401 and DHC-8-
402 aeroplanes, all serial numbers.
Compliance:
As indicated below, unless already accomplished.
Background:
The ALI for the model DHC-8-401 and DHC-8-402 aeroplanes are defined and published in the DHC
Maintenance Requirements Manual (MRM) PSM 1-84-7 Part 2, approved by Transport Canada (TC). The
instructions contained in the DHC MRM PSM 1-84-7 Part 2 have been identified as mandatory actions for
continued airworthiness. Failure to comply with these instructions could result in an unsafe condition.
DHC has introduced changes to the DHC MRM PSM 1-84-7 Part 2 ALI wherein new tasks have been
added and a number of existing tasks have been revised to become more restrictive.
This AD requires completion of the new or more restrictive limitations within their thresholds and repeat
intervals or within the discard time as applicable.
Corrective Actions:
Within the thresholds and repeat intervals identified within the tasks, or discard time, as applicable,
complete the new or more restrictive limitations contained in DHC MRM PSM 1-84-7 Part 2 ALI manual
identified in Table 1 below, as applicable to the aeroplane model and configuration.
Compliance with superseding Temporary Revisions (TR) affecting these tasks or later revisions of DHC
MRM PSM 1-84-7 Part 2 ALI manual, approved by TC, also meets the intent of this AD.

CF-2026-37 2 of 5
Table 1: ALI Tasks, TR
ALI task
number
Config
LTR
Description
TR
revision
Issue
Date
Section
532066F103
A
Detailed Inspection and Special Detailed
Inspection of the VHF No.3 (or ACARS)
Antenna Installation, Sta. X331
APPLICABILITY: (Post Modsum
4−400200) or (Post Modsum 4−121296)
or (Post Modsum 4−110466) or (Post
Modsum 4−124091) or (Post Modsum
4−903208) and ((Pre Modsum 4−458965)
and (Pre Modsum 4−459885))
TR ALI-
0236
10-Feb-
2025
2 Structural
Inspection

532066F103
B
Detailed Inspection and Special Detailed
Inspection of the VHF No.3 (or ACARS)
Antenna Installation, Sta. X331
APPLICABILITY: (Post Modsum
4−400200) or (Post Modsum 4−121296)
or (Post Modsum 4−110466) or (Post
Modsum 4−124091) or (Post Modsum
4−903208) and ((Post Modsum
4−458965) or (Post Modsum 4−459885))
and (EHGW)
TR ALI-
0236
10-Feb-
2025
2 Structural
Inspection
541008F101
B
Detailed Inspection of the Nacelle Mid
Frame Upper Left Aft EMS Strut
Attachment Fitting (Lugs), LH and RH
APPLICABILITY: ((Post Modsum
4−156156) and (Pre Modsum 4−113870)
and (Pre Modsum 4−113968)) and (BGW)
TR ALI-
0201
18-Apr-
2019
2 Structural
Inspection
542015F105
C
Detailed Inspection and Special Detailed
Inspection of the Nacelle ’A’ Frame
Inboard and Outboard Vertical Leg Inner
Flanges Attachment Holes (Adjacent to
Edge of Flange), LH and RH
APPLICABILITY:(Post Modsum
4−113305) and (BGW)
TR ALI-
0201
18-Apr-
2019
2 Structural
Inspection
542015F105
D
Detailed Inspection and Special Detailed
Inspection of the Nacelle ’A’ Frame
Inboard and Outboard Vertical Leg Inner
Flanges Attachment Holes (Adjacent to
Edge of Flange), LH and RH
APPLICABILITY:(Post Modsum
4−113305) and (IGW or HGW or EHGW)
TR ALI-
0201
18-Apr-
2019
2 Structural
Inspection
551004F101
B
Special Detailed Inspection of the
Horizontal Stabilizer Front Spar Joint at
Sta. YH33.0, LH and RH
APPLICABILITY: ((Post Modsum
4−458965) or (Post Modsum 4−459885))
and (EHGW)
TR ALI-
0230
17-Aug-
2022
2 Structural
Inspection
712001F102
H
Detailed Inspection of the Powerplant
Mount, Engine Isolator, Forward Left
(Bracket only, excluding HTCS Link
Ass’ly.), LH and RH
APPLICABILITY: (Post Modsum
4−184092) and (IGW or HGW or EHGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection

CF-2026-37 3 of 5
Table 1: ALI Tasks, TR continuation
ALI task
number
Config
LTR
Description
TR
revision
Issue
Date
Section
712002F101
B
Detailed Inspection and Special Detailed
Inspection of the Powerplant Mount, Engine
Isolator, Forward Top, LH and RH
APPLICABILITY: ((Post Modsum 4−156156)
and (Pre Modsum 4−113870) and (Pre
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
712002F101
C
Powerplant Mount, Engine Isolator, Forward
Top, LH and RH
APPLICABILITY: ((Post Modsum 4−156194)
or (Post Modsum 4−113870) or (Post
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
712004F101
B
Detailed Inspection and Special Detailed
Inspection of the Powerplant Mount, Engine
Isolator, Aft Left, LH and RH
APPLICABILITY: ((Post Modsum 4−156156)
and (Pre Modsum 4−113870) and (Pre
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
712004F101
C
Detailed Inspection and Special Detailed
Inspection of the Powerplant Mount, Engine
Isolator, Aft Left, LH and RH
APPLICABILITY: ((Post Modsum 4−156194)
or (Post Modsum 4−113870) or (Post
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
712005F101
B
Detailed Inspection and Special Detailed
Inspection of the Powerplant Mount, Engine
Isolator, Aft Right, LH and RH
APPLICABILITY: ((Post Modsum 4−156156)
and (Pre Modsum 4−113870) and (Pre
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
712005F101
C
Detailed Inspection and Special Detailed
Inspection of the Powerplant Mount, Engine
Isolator, Aft Right, LH and RH
APPLICABILITY: ((Post Modsum 4−156194)
or (Post Modsum 4−113870) or (Post
Modsum 4−113968)) and (BGW)
TR ALI-
0202
18-Apr-
2019
2 Structural
Inspection
54-00-01-
704
G
Pins − MLG Yoke Attachment
APPLICABILITY: (Post Modsum 4−170096)
and (BGW)
TR ALI-
0233
27-Dec-
2024
3 Structural
Safelife
54-20-01-
701
P
’A’ Frame (Drag Strut Attach.)
APPLICABILITY: ((Post Modsum 4−113159
and Post Modsum 4−113776 and Post
Modsum 4−114003) or (Post Modsum
4−113159 and Post Modsum 4−123818 and
Post Modsum 4−114003) or (Post Modsum
4−113159 and Post Modsum 4−170073 and
Post Modsum 4−114003) or (Post Modsum
4−113159 and Post Modsum 4−170060 and
Post Modsum 4−114003) (Rework: A/C
4081 − 4591)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3 Structural
Safelife
54-20-01-
701
Q
’A’ Frame (Drag Strut Attach.)
APPLICABILITY: (Post Modsum 4−113159
and Post Modsum 4−170060 and Pre
Modsum 4−114003) (New Prod: A/C 4458,
4461, 4462, 4464 to 4591)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3 Structural
Safelife

CF-2026-37 4 of 5
Table 1: ALI Tasks , TR continuation
ALI task
number
Config
LTR
Description
TR
revision
Issue
Date
Section
54-20-
01-701
R
’A’ Frame (Drag Strut Attach.)
APPLICABILITY: ((Post Modsum 4−113159
and Post Modsum 4−113776 and Pre Modsum
4−114003) (Rework: A/C 4081 − 4426)) and
(BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-701
V
’A’ Frame (Drag Strut Attach.)
APPLICABILITY: (Post Modsum 4−113305 and
Post Modsum IS4Q5450002) (Rework: A/C
4003 − 4055)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-703
G
Pin − MLG Drag Strut Attach.
APPLICABILITY: (Post Modsum 4−170096)
and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-704
F
MLG Side Brace Fitting APPLICABILITY: (Post
Modsum 4−114003 (Rework: A/C 4081 −
4591)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-704
G
MLG Side Brace Fitting
APPLICABILITY: (Post Modsum 4−156138 and
Pre Modsum 4−114003) (New Prod: A/C 4081
− 4591)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-705
M
Pins − Side Brace Fitting
APPLICABILITY: (Post Modsum 4−170096)
and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-705
O
Pins − Side Brace Fitting
APPLICABILITY: (Post Modsum 4−170096)
and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-707
O
’A’ Frame (MLG Side Brace Fitting Attach.)
APPLICABILITY: ((Post Modsum 4−113159
and Post Modsum 4−113776 and Post Modsum
4−114003) or (Post Modsum 4−113159 and
Post Modsum 4−123818 and Post Modsum
4−114003) or (Post Modsum 4−113159 and
Post Modsum 4−170073 and Post Modsum
4−114003) or (Post Modsum 4−113159 and
Post Modsum 4−170060 and Post Modsum
4−114003) (Rework: A/C 4081 − 4591)) and
(BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-707
P
’A’ Frame (MLG Side Brace Fitting Attach.)
APPLICABILITY: (Post Modsum 4−113159 and
Post Modsum 4−170060 and Pre Modsum
4−114003) (New Prod: A/C 4458, 4461, 4462,
4464 to 4591)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-707
Q
’A’ Frame (MLG Side Brace Fitting Attach.)
APPLICABILITY: (Post Modsum 4−113159 and
Post Modsum 4−113776 and Pre Modsum
4−114003) (Rework: A/C 4081 − 4426)) and
(BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife
54-20-
01-707
U
’A’ Frame (MLG Side Brace Fitting Attach.)
APPLICABILITY: ((Post Modsum 4−113305
and Post Modsum IS4Q5450002) (Rework: A/C
4003 − 4055)) and (BGW)
TR ALI-
0233
27-Dec-
2024
3
Structural
Safelife

CF-2026-37 5 of 5

Authorization:
For the Minister of Transport,
ORIGINAL SIGNED BY
Liviu Badita
Acting Chief, Continuing Airworthiness
Issued on 5 August 2026
Contact:
Mihaela Kramer, Continuing Airworthiness, Ottawa, telephone 1-888-663-3639, or e-mail
TC.AirworthinessDirectives-Consignesdenavigabilite.TC@tc.gc.ca or any Transport Canada Centre.