- Effective
- April 23, 1970
- Models
- 737-100 Series, 737-200 Series, 737-200C Series, 737-300 Series, 737-400 Series, 737-500 Series and 3 more
- Data sheet
- TCDSA16WE
- Registered aircraft
- 823 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-976
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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| FAA DRS HTML | 20 KB | adc847d2…a94b3f9 | FAA DRS (API key needed) |
On this page
The airworthiness directive
70-09-01 BOEING: Amdt. 39-976. Applies to Model 737 series airplanes.
Compliance required within the next 250 hours time in service after the effective date of this ad, unless already accomplished.
As a result of FAA evaluations of the 737 electrical system sufficient cause has been found to prevent inadvertent operation of the battery switch located on the forward overhead panel. Inadvertent operation of the battery switch during some operating conditions could result in loss of the standby electrical system. To prevent inadvertent operation of the battery switch on the forward overhead panel on the subject 737 series airplanes, accomplish one of the following:
(1) Install a switch guard and light plate per the Boeing Service Bulletin No. 24- 1010 Revision (1) dated April 24, 1970, or later FAA approved revisions.
(2) Replace the battery switch with a detent lock type switch, P/N MS 24659-23D or an equivalent MS type, provided the galley switch is a toggle type.
(3) Perform an equivalent installation approved by the Chief, Aircraft Engineering Division, FAA, Western Region.
This amendment becomes effective April 23, 1970.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 823
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1969 | 1 |
|---|---|
| 1975 | 1 |
| 1979 | 1 |
| 1981 | 1 |
| 1986 | 3 |
| 1987 | 4 |
| 1989 | 2 |
| 1990 | 1 |
| 1991 | 5 |
| 1992 | 4 |
| 1993 | 4 |
| 1994 | 1 |
| 1995 | 3 |
| 1997 | 2 |
| 1998 | 40 |
| 1999 | 87 |
| 2000 | 72 |
| 2001 | 73 |
| 2002 | 10 |
| 2003 | 7 |
| 2004 | 13 |
| 2005 | 14 |
| 2006 | 21 |
| 2007 | 21 |
| 2008 | 26 |
| 2009 | 38 |
| 2010 | 62 |
| 2011 | 21 |
| 2012 | 30 |
| 2013 | 31 |
| 2014 | 23 |
| 2015 | 20 |
| 2016 | 42 |
| 2017 | 72 |
| 2018 | 27 |
| 2025 | 2 |
38 with no year recorded