Federal Aviation
Administration

MMEL Policy Letter (PL) 24  Revision 5

Date:

October 23, 2015

To:

All Aircraft Evaluation Group Managers

From:

Manager, Air Transportation Division, AFS-200

Reply To
Attn Of:

Manager, New Program Implementation Branch, AFS-240

Subject:

Lavatory Fire Protection

MMEL CODE:

26 (FIRE PROTECTION)

REFERENCE:

PL-24, Revision 4, dated November 02, 2009

PL-24, Revision 3, dated October 15, 2001

PL-24, Revision 2, dated August 12, 1999

PL-24, Revision 1, dated August 15, 1997

PL-24, Original, dated May 14, 1987

14 CFR 25.854, 121.308

PURPOSE:

To provide standardized Master Minimum Equipment List (MMEL) requirements for Lavatory Fire Protection systems.

DISCUSSION:

Revision 5 adds relief for lavatory fire protection that is installed in excess of regulation. 14 CFR 121.308 requires that each lavatory in the airplane be equipped with a smoke detector system and built-in fire extinguisher; Parts 91, 125, 129 and 135 are silent with regard to this requirement. 14 CFR 25.854 (50 FR 15450) established these requirements as design standards for airplanes with passenger seating capacities of 20 or more.

Revision 4 clarifies relief for aircraft in cargo configuration and removes the Global Change designation.

Revision 3 establishes lavatory use requirements by crewmembers due to enhanced security requirements adopted by air carriers. This revision provides guidance to crewmembers enabling them to utilize lavatory with an inoperative smoke detection or fire extinguishing system.

Revision 2 deletes the first proviso previously incorporated under Lavatory Smoke Detection System. This revision was the result of a safety recommendation that pointed out that the fire extinguisher system was not effective in all areas of the aircraft lavatory.

Revision 1 reformatted policy letter 24 with no change to policy.

The original PL-24 was based on Amendment 121-185 to 14 CFR dated April 29, 1985, which established equipment requirements to improve cabin fire protection for passenger-carrying transport category airplanes.

 


 

POLICY:

The following standardized policy is established to accommodate all equipment configurations.

 

NOTE: The only operating rule that requires these systems for airplanes seating 19 or less is applicable to nontransport category airplanes conducting Part 121 operations.

 

26 FIRE PROTECTION

Repair Interval

Number Installed

Number Required for Dispatch

Remarks or Exceptions

-XX Lavatory Fire Extinguisher System

 

 

 

 

 

 

 

 

 

1) Passenger Configuration

C

-

0

For each lavatory, the lavatory fire extinguisher system may be inoperative provided the associated lavatory smoke detection system operates normally.

 

 

 

 

 

 

C

-

0

(M)(O) For each lavatory, the lavatory fire extinguisher system may be inoperative provided:

a) Lavatory waste receptacle is empty,

b) Associated lavatory door is locked closed and placarded, "INOPERATIVE - DO NOT ENTER", and

c) Lavatory is used only by crewmembers.

NOTE: These provisos are not intended to prohibit lavatory use or inspections by crewmembers.

 

 

D

-

0

Any in excess of that required by 14 CFR may be inoperative.

 

 

 

 

 

2) Cargo Configuration

D

-

0

 

 

 

 

 

 

-XX Lavatory Smoke Detection System

 

 

 

 

 

 

 

 

 

1) Passenger Configuration

C

-

-

(M)(O) For each lavatory, the lavatory smoke detection system may be inoperative provided:

a) Lavatory waste receptacle is empty,

b) Associated lavatory door is locked closed and placarded, "INOPERATIVE - DO NOT ENTER", and

c) Lavatory is used only by crewmembers.

NOTE: These provisos are not intended to prohibit lavatory use or inspections by crewmembers.

 

 

D

-

0

Any in excess of that required by 14 CFR may be inoperative.

 

 

 

 

 

2) Cargo Configuration

D

-

0

 


 

 

Each Flight Operations Evaluation Board (FOEB) chairman should apply this policy to affected MMELs through the normal FOEB process.

 

 

 

Original signed 10/23/2015

 

Leslie Smith

Manager, Air Transportation Division, AFS-200